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 purpose for the bag or box on top of some survival craft is to（）.
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The locking pin that joins the parts of a detachable link is held in position by（）.
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