單項(xiàng)選擇題

An oxygen indicator can be used to determine if there is（）.

A.sufficient oxygen in a compartment to support life
B.combustible gases present
C.hydrogen gas present
D.All of the above

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單項(xiàng)選擇題

An on-load release system on a survival craft means the cable can be released（）.

A.only when the load is taken off the cable
B.only when there is a load on the cable
C.only when activated by the controls at the lowering station
D.at any time

單項(xiàng)選擇題

An effective braking system for windlasses on rigs in deep water is a(n)（）.

A.larger chain stopper
B.disc backstopping brake
C.hydraulic clutch
D.electrical regenerative braking system