单项选择题

Two types of anchor shackles which are currently available are（）.

A.U-Type and posilok shackles
B.C-Type and wedge shackles
C.D-Type and bow shackles
D.wedge and kenter shackles

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The revolving drum of a winch used to haul lines is called a（）.

A.bull gear
B.gypsyhead
C.spanner
D.wildcat
单项选择题
The purpose for the bag or box on top of some survival craft is to（）.

A.right the craft in case of capsizing
B.increase area for radar detection
C.act as a sail in case of a power loss
D.steady the craft in heavy seas
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