单项选择题

Ropes can be divided into three types: （）.

A. natural fiber rope, manila rope and synthetic rope
B. natural fiber rope, synthetic rope and wire rope
C. synthetic rope, manila rope and wire rope
D. synthetic rope, manila rope and wooden rope

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Ropes can be divided into （）basic types.

A.3
B.4
C.5
D.6

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It is very important for every sailor （）the characteristics of the ropes so that they can be for right jobs.

A.knowing
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This windlass （）now.

A. has repaired
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C. was repaired
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