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單項選擇題

After the boat is at the top of the davit heads，the davit arms begin moving up the tracks and are stopped by the（）.

A.hoist man
B.limit switch
C.brake handle
D.preventer bar

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單項選擇題

A vessel may be unable to take proper and effective action due to the speed（）too high or，in some circumstances，too low.

A.is
B.is to be
C.will be
D.being

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A tourniquet should be used to control bleeding ONLY（）.

A.with puncture wounds
B.when all other means have failed
C.when the victim is unconscious
D.to prevent bleeding from minor wounds