單項選擇題

The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the（）.

A.actuator
B.annulus
C.accumulator
D.annular preventer

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單項選擇題

The shut off valve at the gasoline tank which can be operated from outside the tank space （）.

A.controls the amount of gasoline to the engine
B.shuts off the gasoline supply at the tank
C.is used if the gasoline tank leaks
D.All of the above

單項選擇題

The primary hazard of liquefied petroleum gas and liquefied natural gas is（）.

A.pressure
B.toxicity
C.temperature
D.flammability