单项选择题
The revolving drum of a winch used to haul lines is called a（）.
A.bull gear
B.gypsyhead
C.spanner
D.wildcat
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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 -
单项选择题
The locking pin that joins the parts of a detachable link is held in position by（）.
A.a tack weld
B.the self-locking characteristics of its taper
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单项选择题
The lifeline of a life float or buoyant apparatusshall（）.
A.be at least 3/8 inch diameter and properly secured around the sides and ends of the device
B.be festooned in bights not longer than three feet long
C.have a seine float in each bight unless the line is an inherently buoyant material
D.All of the above
