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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相关考题
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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
