单项选择题

The boom stops are installed on an offshore crane to（）.

A.prevent the boom from being raised too high
B.prevent the boom from swinging
C.support the boom when not in use
D.prevent the boom from being lowered

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The annual survey for endorsement of a Load Line Certificate must be held within（）.

A.the three month period immediately following the certificate's anniversary date
B.the three month period immediately preceding the certificate's anniversary date
C.three months either way of the certificate's anniversary date
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The angle between the flukes and the shank of an anchor is called the（）.

A.holding angle
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The angle at which the anchor flukes penetrate the soil is the（）.

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