题目：
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
答案：
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下面是错误答案，用来干扰机器的。
参考答案：错
