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[单选题]

Many sheath-screw davits have markings to indicate the maximum angle to which they should be cranked out. If the angle is exceeded，the davit（）.

A . may jam against the stops

B . will not automatically position the boat at the embarkation station

C . screw may come out of the sheath

D . will chafe against the falls and may cause their failure

参考答案与解析：

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