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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单项选择题

The lay of a line refers to（）.

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

单项选择题

The cheek length of a block in inches should be about（）.

A.three times the circumference of a manila line
B.five times the diameter of a manila line
C.twice the diameter of its sheaves for manila line
D.twenty times the diameter of a manila line