單項(xiàng)選擇題Diesel fuel is relatively safe to handle due to its low volatility, but the fumes will self-ignite and continue to burn steadily if the fuel is heated to the （）.

A.flash point
B.auto-ignition point
C.volatility point
D.upper explosive limit


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1.單項(xiàng)選擇題If the buoyant force on a ships hull is equal to or greater than the displacement tonnage, the ship will （）.

A.require ballast added to only the port side tanks
B.be down by the head
C.sink
D.float

2.單項(xiàng)選擇題When fighting an electrical fire, you should first （）.

A.stop ventilation to the area
B.stop the vessel
C.secure electricity to the circuit
D.apply CO2 to the fire

3.單項(xiàng)選擇題You are transferring fuel from the storage tanks to the day tanks by means of an electric fuel oil transfer pumpIf the pump motor catches fire, you would FIRST （）.

A.secure the fuel manifold
B.shut off power to the pump
C.shut off the power ventilation
D.spray water on the fire

4.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

5.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