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家 在线测试 CES Passenger Deck Support Test online CES 5.1 for Deck department, Support level, Passenger vessel
在线测试： Test online CES 5.1 for Deck department, Support level, Passenger vessel
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*What is the minimum capacity of a ventilation system protecting cargo spaces, other than special category spaces, intended for carriage of motor vehicles with fuel in their thanks for their own propulsion in a ship carrying no more than 36 passengers or in a cargo ship?
2 air changes per hour
20 air changes per hour
12 air changes per hour
6 air changes per hour
You wish to send a message via an Inmarsat-C installation to an Inmarsat-A telex installation. The message is composed in ‘ASCII’. The message can be sent:
as a telex
can not be sent
as a fax
Don't know
DSC-transmissions with the tele-command ’test’ can:
be sent by a VHF-installation on the DSC-distress channel
not be sent by VHF-installation
Don't know
be sent by a VHF-installation or the SAR-channel
The “squelch” adjustment on the front panel of a mariphone serves to:
adjust the transmitting power of the mariphone
Don't know
adjust the noise threshold of the mariphone receiver
limit the noise of the mariphone transmitter
A Cargo Ship Equipment Certificate will be issued for :
A period not exceeding 24 months
A period not exceeding 48 months
A period not exceeding 6 months
A period not exceeding 12 months
How do you consider the indicated speed for berthing?
To be sufficient
Too slow
Too fast
It is up to the pilot to decide
You are sailing in shallow water, with 15% Under Keel Clearance. With full RPM, what will your speed be compared to deep water?
Faster
Stay the same
Slower
The RPM will drop with 15% of full
Which of the alternative methods of using a tug when escorting your ship through narrow waters do you think is the most effective if you lose steering power?
The tug-s bow against my stern, made fast with lines. By moving the tug to either side of my stern, this will help to steer the ship (figure 4).
Running free alongside, ready to be made fast (figure 2)
Made fast forward on either shoulder, ready to push (figure 3)
Made fast in a line at the bow (figure 1)
Ordinary thyristors (SCR) must often be protected against reverse overvoltage transients because even over-voltages of extremely short duration can destroy them. These circuits have been given such over-voltage protection, but only one of them is correct. Which?
Figure 2
Figure 3
Figure 1
Figure 4
In a typical shipboard de-humidifier plant as may be found on a modern chemical tanker, operating on a "rotating bed" principle, what names are given to the two parts of the rotating bed?
The "live sector" and the "reserve sector".
The "process sector" and the "reactivation sector".
The "active sector" and the "dormant sector".
The "inbound sector" and "outbound sector".
Which is the lee side of a ship?
The lee side is the side facing the wind
The lee side is abaft the accommodation
The lee side is the side facing away from the wind
The lee side is forward of the accommodation
Which publication gives guidance on the stowage and securing of general cargo?
IMO Code of practice for stowage and securing of cargoes
SOLAS Safety Training Manual
IMO Code of Practice for Bulk Cargoes
International Load Line Regulations
A heavy metal concentrate bulk cargo has a moisture content of 16 and a transportable moisture limit of 18, what should the Master do?
Request additional moisture tests to be done
Seek advice from charterers and owners
Refuse to load the cargo as the moisture content is outside acceptable limits
Load the cargo as the moisture content is within acceptable limits
On the bridge of a RoRo vessel, which of the following doors have no open/closed bridge indicator requirements?
Doors leading into the engine room
Hinged doors in watertight bulkheads
Shell doors and stern ramps
Sliding doors in watertight bulkheads
How should packaged units be secured below decks?
By means of adequate timber shoring and wedging for individual units
By means of adequate wire lashings for units grouped together
By making a chock-a-block stow so that units will not shift
By means of adequate timber shoring and wedging for units grouped together
On a RoRo vessel, what is the Maximum Securing Load of reusable use wire ropes?
30% of the breaking strength
40% of the breaking strength
25% of the breaking strength
What is the main information we get from a Mollier diagram?
We get information about enthalpy, specific volume of vapour, liquid/vapour mixture, temperature of vapour when pressure is known and pressure in the cargo tank when liquid temperature is know.
We get information about enthalpy, specific volume of vapour, liquid/vapour mixture, temperature of vapour when pressure is known.
We get information about enthalpy, specific volume of the liquid and latent heat.
We get information about specific volume of vapour, liquid/vapour mixture, temperature.
What name is given to the oriental pan which has a small round base and wide sloping sides, commonly used for cooking "stir-fry" dishes?
Gok.
Wok.
China pan.
Wack.
What is the correct name of the part highlighted in the sketch?
Fuel injector
Air inlet valve
Exhaust valve
Air starting valve
During inspection of a cylinder liner for a large, slow speed diesel engine it is found to be worn in a cloverleaf pattern. The greatest points of wear are found to be in way of the cylinder lubricator holes. From the options given, what is the most likely cause of this type of wear pattern?
Excessive cooling of the cylinder liner at low load operation.
Fuel impingement on the liner due to faulty fuel injector nozzle.
Cylinder lubricant has too high an alkalinity for the sulphur content of the fuel.
Insufficient cylinder lubricating oil being supplied.
Which of the following letter combinations represents a level indicating controller on a process and instrumentation diagramv
CIL
LIR
CIR
LIC
Read the text in the picture before answering the question. What is the fundamental requirement relating to the older ships, which are still in service?
The older ships should be scrapped to make way for the new builds.
The older ships must be in good condition.
The older ship must be cheaper to run than the new builds.
As a result of the new building activities, older ships are no longer required.
On a Container vessel, what facilitates the lashing of containers in the fourth and fifth tiers?
Long lashing rods with extensions
The lashing bridge
Long lashing rods
Raised deck platforms
If the general alarm is sounding and evacuation of the ship is required. What is the best way to ensure that all passengers are aware of the situation?
Use Public Address system to inform the passengers. Inform all passengers to report to designated area for head count.
Crew with designated emergency duties should proceed to the muster station to count all passengers in his section. If somebody is missing, report to their superior.
Inform the passengers through Public Address system. Crew with designated emergency duties should proceed to their cabin section and search all cabins. Guide and evacuate passengers. If the area is inaccessible report to their superior or the bridge.
Alarm signal and Public Address system will be effectively, including head count at muster point.
Two identical medium speed engines are connected through clutches and a reduction gearbox to a single controllable pitch propeller. It is noted during normal operation that the load sharing between the engines is uneven with one engine taking a greater proportion of the load as the total load increases even though they are equally loaded at low load. Select from the options given the most likely cause of this problem.
One of the engines is running faster than the other at high loads.
The fuel filters in the supply line for one of the engines are blocked
The governor droop settings are incorrectly set and are not matched.
The clutch on one engine is slipping.
What is the requirement with regard to Familiarisation on board?
During the first tenure, seafarers are responsible for asking at least a 100 questions to the Safety Officer.
Seafarers, on being assigned to any ship, shall be familiarized with their specific duties and with all ship arrangements, installations, equipment, procedures and ship characteristics that are relevant to their routine or emergency duties.
Seafarers on board passenger vessels must as soon as possible learn the names of all persons working in the same department in order to ensure efficient daily operation.
Seafarers shall be familiarized with all life saving appliances and emergency exits in case any emergency situation occurs. It takes normally an hour to complete the Safety Familiarisation. The safety Officer is responsible.
Why is the tank washing discharge outlet located below the waterline on a chemical tanker?
So that a safe and legal rate of dilution is achieved in the wake as the ship proceeds along.
So that toxic vapours are neutralised by the layer of water above the outlet.
So that tank cleaning can be carried out without anyone noticing.
So that there is minimum resistance to the flow generated by the pumps as they discharge the washings.
On the figure 4 possible definitions of the term "AHEAD" are given. Which one is the correct one?
Ahead is given by C on the figure
Ahead is given by B on the figure
Ahead is given by A on the figure
Ahead is given by D on the figure
What percentage of the ship’s stores are required to be inspected at Security Level 3?
25-50% of the ship's stores are required to be inspected at Security Level 3.
5-20% of the ship's stores are required to be inspected at Security Level 3.
50-80% of the ship's stores are required to be inspected at Security Level 3.
100% of the ship’s stores are required to be inspected at Security Level 3.
Zener barriers are sometimes used to supply power to electronic equipment in hazardous areas. Which statement is correct with regards to power supply for equipment supplied through Zener-barriers?
The 0-volts line must always be grounded.
The +24V must always be grounded.
The 0-voltage must never be grounded.
The - 24V must never be grounded.
The 'Critical Temperature' is important when dealing with liquefied gas cargoes. What is the IMO Gas Codes' definition of the term 'Critical Temperature'?
It is the temperature at which vapours from a liquefied gas cargo will self-ignite.
It is the temperature above which a gas cannot be liquefied by pressure alone.
It is the temperature at which liquefied gas cargoes give off flammable vapours.
It is the temperature at which a cargo of liquefied gas must be carried.
What collective culinary term is given to the internal organs of a butchered animal, such as the heart, kidneys, liver, tripe, etc?
Glands.
Offal.
Intestines.
Oval.
Your vessel is entering a tropical area and high humidity is expected. To avoid condensation in the main engine's air cooler, it is recommended to:
Decrease the air temperature so proper draining can be achieved from the air cooler
Increase scavenging air temperature to above dew point
Reduce speed.
Operate the engine with slightly open drain cocks, scavenging to get rid of the water
Some process control systems may several inputs and controlled variables. In this context what is meant by split-range?
On-Off control
Several controllers are connected to the same control-valve
Several control-valves are connected to the same controller
Several control-loops for the same range
On a Container vessel, when will a lashing plate crack or buckle?
When lashings lead vertically from the plate
When the lashings and plate are in the same plane
When the lashings and plate are not in the same plane
When more than one lashing is attached to a plate
The ship's crew are carrying out maintenance on the weather deck hatch lids of a refrigerated cargo space. Which of the parts given in the options will have the greatest influence on maintaining cargo temperature in relation to the hatch lid system?
The condition of the hatch lid wheels.
The condition of the hatch lid seals.
The condition of the hatch lid hinges.
The condition of the hatch lid trackway.
Tank venting systems should be designed and operated so as to ensure neither pressure nor vacuum created in cargo tanks during loading or discharging exceeds tank design parameters. A certain rate of generation of vapour during loading, sometimes termed gas evolution, is assumed. According to the IBC Code, how is that calculated?
The nominal loading rate is multiplied by a factor of 1.15
The maximum loading rate is multiplied by a factor of at least 1.25
The average anticipated loading rate is multiplied by a factor of 2.0
The calculated loading rate, assuming a litreweight of 1.2 kg/l and allowing for a friction loss of 12% per 30 metre length of unrestricted pipeline, is multiplied by a factor of 1.15 (A safety margin of 20% is additionally applied for products with a vapour pressure of greater than 1.15 mPa).
Which statement is true?
Normal temperature of the lub oil after the cooler is approx. 45 C.
When the ME is running, the Fresh Water enters the engine at the top and leaves the engine at the bottom
Normal temperature of the oil after the cooler is approx. 65 C.
Minimum scavening air temperature is 60 C to avoid dewing in the scavening air cooler
In some reefer trades cargoes of chilled horse meat carcasses are stowed hanging from deckhead rails in refrigerated locker spaces. What position should the centre of gravity be assumed to be at when carrying out the stability calculations for a vessel with such a stow?
At the mid-height of the hanging carcasses.
At the deckhead of the lockers.
At the point indicated for the lockers in the approved stability handbook.
At the point indicated for the lockers in the approved stability handbook with an arbitrary adjustment to take account of the centre of mass of the hanging carcasses.
What should one consider prior to loading machinery with caterpillar crawlers on the hatch covers?
The horizontal restraint of hatch covers
The horizontal restraint of hatch coamings
Maximum permissible loading of the hatch covers and the horizontal restraint of hatch covers and coamings
Maximum permissible loading of the hatch covers
What is the minimum permissible distance measured horizontally between the ship's shell plating and the outer side bulkhead of the first cargo compartment on a type II chemical tanker?
Not less than moulded breadth / 5.
Not less than 1250 mm.
Not less than 760 mm.
Not less than moulded breadth / 15.
Some liquefied gas carriers require a secondary barrier as part of the cargo containment system. What is the main purpose of a secondary barrier on these gas carriers?
To provide temporary containment of any leakage of cargo through the primary barrier.
To reduce heat leakage into the cargo.
To hold the thermal insulation for the primary barrier in place.
To connect the cargo containment system to the ship's hull.
The densities of most hydrocarbon gas mixtures which evolve from normal petroleum products are greater than the density of air. What would be the approximate relative density of a mixture of 50% by volume of air and propane relative to 100% air?
1.8
1.25
2.0
1.55
What extra precautions should be taken by the officers and crew if some of the passengers are disabled, i.e. using wheelchair, cane, blind etc.?
Passenger with some form for disability must travel with accompany, and live in same cabin or next door.
Locate them in large cabins to ease their stay.
They must be placed in cabins on the same level as the muster station.
All passengers that will require extra assistance, also in case of an emergency situation/ evacuation, must be registered in order to allocate crew to assist them if needed.
In the ISGOTT Guide, petroleum products are divided into two general groups for the purposes of indicating flammability, based on flashpoint and vapour pressure. These two groups are named 'Volatile' and 'Non-volatile'. To be considered Non-volatile, which of the following criteria must be met?
With a Flashpoint of 60 degrees C or above (open cup method), these liquids produce, when at any normal ambient temperature, equilibrium gas concentrations above the Upper Flammable Limit.
With a Flashpoint of 60 degrees C or below (closed cup method), these liquids produce, when equal to or below any ambient temperature, gas concentrations of less than 5% by volume.
With a Flashpoint of 37.8 degrees C or above (open cup method), these liquids produce, when at any normal ambient pressure, equilibrium gas concentrations below the Lower Flammable Limit.
With a Flashpoint of 60 degrees C or above (closed cup method), these liquids produce, when at any normal ambient temperature, equilibrium gas concentrations below the Lower Flammable Limit.
Which of these actions should crew take if a suspicious object that may be a bomb is located during a search?
Cover the suspicious object with a box or blanket.
Place the object in a desk drawer or file cabinet.
Throw the object overboard.
Confirm with their search partner that the object found is suspicious.
In bulk carrier design what constitutes the main structural strength element?
The deck plating and shell frames
The collision bulkhead
The shell plating
The transverse watertight bulkheads
A fully refrigerated liquified gas carrier, equipped with membrane tank with MARVS less than 0.7 bar and cargo temperature of less than -10 C. What type of barrier is required?
Complete secondary barrier.
No secondary barrier required.
Partial secondary barrier.
No barrier required.
You are alongside and the hoses have been connected for discharge. The jetty-man shouts across to you, telling you to start cargo. The Duty Officer has not yet given you any instructions to commence. What will you do?
Open the valves and start discharge as soon as possible.
Advise the jetty-man that there is a problem on board and you will notify him when you are ready.
Ignore the jetty-man. Do nothing.
Advise the Duty Officer and await further instructions. Ask the jetty-man to stand by.
Which of the following letter combinations represents a temperature controller on a process and instrumentation diagram?
PIC
TIC
TC
FIC
What special requirements applies to fire alarm signalling systems in passenger ships
Same requirements for Fire alarm systems applies to all ships
Remote control of fire doors and reactivation of ventilation
Centralized in a continuously manned control station with remote control of fire doors, Indication of open or closed fire doors
Fail safe, Centralized in a continuously manned control station, Remote control of fire doors, Indication of open or closed fire doors, Reactivation of ventilation, Detector status, Back up powered
What name is given to the flow diagrams that appear in the Annex II Procedures and Arrangements Manual, which guide the user through the methods to be followed in cleaning a tank after containing a Noxious Liquid Substance?
Collection and Disposal Protocol.
Cleaning and Pumping Diagrams.
Cleaning and Disposal Procedures.
Chemical Disposal Plans.
Which of the following instruments is normally part of a control-loop
Transducer
Plotter
Gauge
Indicator
How is positive stability maintained when loading heavy lift cargoes?
By completely filling the ship’s double bottom tanks and monitoring the loading operation
By monitoring the vessel’s stability during the loading operation
By completely filling those double bottom tanks associated with the cargo hold concerned
By listing the vessel to the opposite side to which the load is being lifted
When should a crane or derrick sheave be replaced?
When wear down in the groove exceeds 20% of the wire rope diameter
When wear down in the groove exceeds 25% of the wire rope circumference
When wear down in the groove exceeds 25% of the wire rope diameter
When wear down in the groove exceeds 20% of the wire rope circumference
With regard to the characteristics of a mafi trailer what must be ensured prior to unfastening this unit on board a ro-ro vessel?
That the cargo details have been checked
That there is sufficient room for it to be driven away
That cargo on the trailer is not damaged
That after unfastening it will not move
Shortly after entering the cargo hold of a General Cargo ship to discharge logs, two dockers are seen to collapse; what is the immediate action to be taken by the OOW ?
Assume injuries are due to illness; stevedore and docker foreman to deal with situation
Enter space immediately to administer first aid
Sound general alarm, call emergency services ashore and prepare rescue team with self-contained breathing apparatus
Muster emergency rescue team and prepare to rescue casualties
The bilge holding tank level is being reduced by discharging through the OWS. What action should be taken when the oil/water interface in the holding tank is reached?
Stop the OWS and pump the oil to the incinerator tank.
Stop the OWS and pump the oil to a bunker tank.
Bypass the OWS and discharge the remaining contents of the holding tank overboard.
Continue pumping the contents of the holding tank through the OWS.
The pressure control of a vessel's domestic water system, which includes a hydrophore tank pressurised by air, is achieved by stop/start of the fresh water pumps using pressure switches. How should the system be prepared for first use to give correct operation of the pressure control?
Fill the hydrophore tank to approximately 75% full with water and then pressurise with air up to the pump cut out point.
Fill the hydrophore tank up with freshwater allowing it to compress the air already in the tank and then adjust the pump cut out to match the pressure in the tank when it is almost full.
Pressurise the hydrophore tank with air to approximately 50% of the pump cut out pressure and then allow the pump to fill the tank until it cuts out.
Fill the hydrophore tank completely with water and then pressurise with air up to the pump cut out point.
Besides the Jensen Sling, what other method is used to load and discharge paper reels from a general cargo vessel?
The vacuum lift
Wire net slings
Wire ropes
Endless rope slings
What type of cargo shall always be secured?
The driver must ask the crew to secure the vehicle and its cargo
Tank lorries should always be secured.
Freight vehicles carrying dangerous goods and adjacent vehicles should always be secured.
No cargo or vehicles have to be secured if the weather conditions are favourable.
Prior to removing the access doors to a pressure vessel for internal maintenance it should be ensured that all pressure has been relieved. As well as a zero indication on a pressure gauge which other measure, from the options given should be taken to confirm this prior to commencing the work?
Open the drain valve when the gauge reads zero to check that there is no outflow.
Open the drain valve and when the outflow stops slacken off the drain valve flange bolts and 'crack' open the flange in case the drain is blocked.
Open the drain valve while pressure still shows on the gauge and to check it is clear. Outflow should cease as the pressure gauge reaches zero.
Back of the tensioning device for the relief valve to vent the pressure to atmosphere.
When overhauling a medium speed diesel engine cylinder cover part of the work involves inspection of the springs for the inlet and exhaust valves. Which of the options given would be the normal inspection method used?
Visual inspection and measurement of free length.
Visual inspection and measurement of spring compression under a known load.
Inspection using dye penetrant and measurement of spring compression under a known load.
Inspection with ultra sound and measurement of free length.
What is the requirement to membranes on Independent Tank Type "A"?
No barrier required.
Complete secondary barrier.
Only primary barrier required.
Partial secondary barrier.
What should be done when flammable vapours are detected in a cargo hold?
Stop the hold ventilation and close all ventilator covers
Stop the hold ventilation
Run the hold ventilation in ‘supply’ mode
Run the hold ventilation in ‘exhaust’ mode
On a Container vessel, where should containers containing marine pollutants be stowed?
Under-deck
In the foremost container bay on deck
Anywhere on deck at the extremity of a container stow
In the last container bay on deck
What is the main effect on lubricating oil of operating for long periods at excessively high temperature?
It will change the flashpoint of the oil.
It will cause the oil to oxidise, reducing the viscosity.
It will cause the oil to oxidise, increasing the viscosity.
It will cause the oil to evaporate, increasing consumption.
Which of the following is associated with staphyloccocal food posining?
Uncooked fish that has been defrosted overnight in a refrigerator.
Food that is not kept properly hot (or cold) as required.
Raw salad leaves.
Unwaxed citrus fruit.
Which of the following has the highest diffusion resistance?
Stationary air.
Glass:
Mineral wool.
Freon 22.
What is the primary hazard associated with the carriage of a bulk cargo of salt on a Bulk Carrier?
There are no special hazards associated with this cargo
The cargo may be liable to self heat.
The only possible hazard is associated with ingress of water into the hold and a loss of stability
This cargo maybe liable to spontaneous combustion
What is the name by which the regulations which prevent and control pollution from ships are known?
The International Shipping Pollution Laws.
SOLAS
MARPOL
The ISP Code.
What can cause crewmembers to abdicate their safety roles?
Inadequate fire-fighting training
No lifeboat drills for passengers
Lack of leadership
Inadequate fire-fighting provisions
If the A.C. line current in a generator stator is doubled, the heating effect in the stator windings will:
Quadruple
Double.
Remain about the same.
Half.
From the options given, select the one which best completes the following statement. "A seaman who is required to work in a hatch containing perishable goods should wear gloves that are…
…canvas."
…leather palmed."
…clean."
…insulated."
Which of the answers best summarises the information which should be provided for the bridge Officers of the Watch within an effective Voyage plan.
All of the suggested answers
Expected prevailing wind and weather
Contingency arrangements in case of problems
Courses to steer; distance off dangers; parallel index lines; expected currents; prevailing winds; distance between alteration points.
What would be the most probable cause if the exhaust gas from a diesel engine looked a bit blue in colour?
Bad fuel oil.
Clogged charge air cooler.
Engine is too cold.
Engine burning too much lubricating oil.
Which Security Levels requires the highest security alert?
Security Level 2
Security Level 1
Security Level 3
.
Select the option which correctly completes the following statement. "A conventional reefer vessel operating with a controlled atmosphere plant must have cargo spaces which…
… have a gas tight seal."
… are fitted with variable speed fans."
… have the normal bulkhead and deckhead penetrations required for a reefer compartment."
… have a minimum number of deckhead and bulkhead penetrations."
You should use short and simple words, rather than long, complex words, when giving emergency instructions. What is the main reason for this?
People are more likely to understand you.
You won't have to think too hard about what you are saying.
You won't have to repeat the instruction.
Short words take less time to say and you don't have much time.
In what circumstances can a ships loading computer be used with confidence on a container vessel.
When the computer has been manufactured by a reputable supplier.
When a new computer with a large RAM has been received.
When the loading computer has been approved by Class.
When the computer has been supplied by the company IT department.
Large slow speed diesel engines are usually of the crosshead type and have various arrangements to deliver lubricating oil directly to the crosshead bearings and guides to ensure adequate lubrication. Why are the crosshead bearings considered differently to the other bearing in this type of engine in respect of lubrication requirements?
The lubricating oil has further to travel to the crosshead bearing and so a separate arrangement is necessary
The crosshead bearing is more heavily loaded than other bearings in the engine so requires more oil to keep it cool.
The crosshead bearing is closer to the engine cylinder and therefore runs hotter.
The running surfaces oscillate relative to each other during operation rather than rotate and therefore full film hydrodynamic lubrication is not possible.
Why should cargo residues be removed from bilge wells?
Because corrosion will occur
Because bilge sounding pipes could become blocked
Because moisture levels will increase in the cargo holds
Because other cargoes will be contaminated
Which of the following alternatives summarise the benefits of using high voltage on ships?
More efficient transformers and electrical machines
Smaller cables and better power factors
Smaller conductors, insulators and transformers
Smaller conductors, machines and switchgear
After main power is restored, a timed sequential restart of motor-driven auxiliaries is necessary to avoid:
Overvoltage due to current surges
Generator overload due to many motors starting at simultaneously
Overloading creating earth faults
Over-frequency due to overspeed of generator
The cargo tanks of liquefied gas carriers are usually insulated. Why is it necessary to insulate these tanks?
To protect the cargo tank from collision damage.
To minimise heat transfer to the cargo and to avoid excessively low hull temperatures.
To prevent static electricity build up in the cargo tanks.
To reduce the volume of the hold space.
When tuning a cascade control system, where do you start
The slave controller with the master controller in manual mode
The master controller
The slave controller with the master controller in auto mode
Both at the same time
During bunker transfer operations, deck scuppers should be:
Plugged when required
Plugged to prevent spilled oil flowing overboard
Only fitted to the side of the vessel that bunkers are being loaded
Attended by crew to collect any spilled oil that approaches
For a Nitrate based cooling water treatment system, what would you consider to be the normal operating limits?
0-1000 PPM Nitrate.
3000-5000 PPM Nitrate.
1000-2000 PPM Nitrate.
2000-3000 PPM Nitrate.
How many buoyant smoke signals are carried in each lifeboat?
6
12
4
2
Apart from red, what other colour is frequently used for a dry powder extinguisher?
Blue
Green
Yellow
Black
该在线测试包含来自 CES 5.1 测试的 90 道随机问题，涉及您选择的主题。