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單項選擇題

The vapor pressure of a gas is the pressure necessary to keep it in a(n)（）.

A.soluble state
B.solid state
C.liquefied state
D.inert state

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The tops of vents from gasoline tanks should terminate（）.

A.in open air
B.inside cabins
C.in machinery space
D.underwater

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