单项选择题
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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A.is
B.is to be
C.will be
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A.with puncture wounds
B.when all other means have failed
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Preventer bars are fitted on lifeboat releasing hooks to prevent（）.
A.the falls from unhooking if the releasing gear is operated accidentally while the boat is being lowered
B.operation of the release lever until the boat is waterborne
C.the falls from rehooking after they have been released
D.accidental unhooking when the falls become slack
