單項(xiàng)選擇題If the diesel fuel vapors present are within the flammable range （）.

A.the vapor air mixture is too rich to burn
B.an explosion may occur if a source of ignition is present
C.the vapor air mixture is too lean to bum the upper explosive
D.limit has been exceeded


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1.單項(xiàng)選擇題Before attempting to put out a class “C” fire involving an electric-driven centrifugal pump, you should FIRST （）.

A.insulate your shoes
B.ground the fire hose
C.secure its power supply
D.start the fire pump

2.單項(xiàng)選擇題While working in the engine room, you hear seven short blasts followed by one long blast on the ships whistle, supplemented by the same signal on the general alarm bellsYou should （）.

A.start the fire pump to charge the fire main
B.standby the main console and await orders from the engineer on watch
C.go to your fire station
D.go to your lifeboat station

3.單項(xiàng)選擇題All personnel should be familiar with the lifeboats （）

A.boarding and operating procedures
B.maintenance schedule
C.navigational systems
D.fuel consumption rates

4.單項(xiàng)選擇題The necessity for administering artificial respiration may be recognized by the victims （）.

A.vomiting
B.blue color and lack of breathing
C.irregular breathing
D.unconscious condition

5.單項(xiàng)選擇題Which of the actions listed should be taken FIRST to control an oil fire in a fuel oil tank?（）

A.Commence draining that tank as quickly as possible
B.Seal off all vents to that tank
C.Activate the CO2 system to that tank
D.Shut off the steam heating coils