单项选择题

The burden of proving unseaworthiness is upon those who（）it.

A.approves
B.alleges
C.allows
D.permits

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The bottom of the mast rests on a part of the keel called the mast（）.

A.foot
B.heel
C.step
D.sole

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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

单项选择题

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
D.the three month period centered on the certificate's anniversary date