单项选择题
On your vessel，a wire rope for the cargo gear shows signs of excessive wear and must be replaced. In ordering a new wire for this 10-ton boom，what safety factor should you use?（）
A.Three
B.Five
C.Six
D.Seven
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单项选择题
On an anchor windlass，the wheel over which the anchor chain passes is called a（）.
A.brake compressor wheel
B.devil's claw
C.wildcat
D.winchhead -
单项选择题
On a long ocean tow，the bridle should be made up of two equal lengths of（）.
A.chain
B.wire
C.nylon
D.manila -
单项选择题
On a light tow，what could you substitute for a fishplate?（）
A.heart-shaped shackle
B.pelican hook
C.swivel
D.ring
