单项选择题
Before personnel are lifted from a vessel in a personnel basket，the vessel should be（）.
A.directly under the boom
B.moving away from the boom
C.stopped dead in the water
D.tied to the boom
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A.hoist man
B.limit switch
C.brake handle
D.preventer bar -
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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
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A.with puncture wounds
B.when all other means have failed
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