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單項(xiàng)選擇題

（）should be greased every month or two and it should be kept on a reel when not in use.

A. Wire rope
B. Hemp rope
C. Nylon rope
D. Wooden rope

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單項(xiàng)選擇題

Wire rope should be greased （）when not in use.

A. every half a month
B. every month or two
C. every half a year
D. every year

單項(xiàng)選擇題

Coil left-handed ropes （）.

A. clockwise
B. anticlockwise
C. to the center
D. to the left