單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題On a long ocean tow，the bridle should be made up of two equal lengths of（）.

A.chain
B.wire
C.nylon
D.manila

3.單項(xiàng)選擇題On a light tow，what could you substitute for a fishplate?（）

A.heart-shaped shackle
B.pelican hook
C.swivel
D.ring

4.單項(xiàng)選擇題Nylon rope is often used in the makeup of a towline because it（）.

A.floats
B.stretches
C.handles easily
D.resists rot