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
C.a cotter pin
D.a lead plug

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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

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The lay of a line refers to（）.

A.its normal location of stowage
B.the direction of twist in the strands
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D.the manner in which it is rigged

单项选择题

The grooved wheel inside a block is called a（）.

A.cheek
B.gypsy
C.sheave
D.drum