单项选择题

A single heavy wire made up for the topping lift is called a（）.

A.bale
B.spanner wire
C.bull line
D.working guy

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A serving mallet is used in（）.

A.covering wire or fiber rope
B.forcing fids into a line
C.dogging hatches
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A sea anchor is（）.

A.a heavy anchor with an extra long line used to anchor in deep water
B.a cone shaped bag used to slow down the wind drift effect
C.a padeye to which the sea painter is made fast
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A safety shackle is identified by its（）.

A.shape
B.pin
C.certification stamp
D.color code