单项选择题
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
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相关考题
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单项选择题
Coil left-handed ropes （）.
A. clockwise
B. anticlockwise
C. to the center
D. to the left -
单项选择题
Coil the right-handed ropes（）.
A. to the right
B. to the left
C. anticlockwise
D. clockwise -
单项选择题
In stowage, keep nylon rope away （）heat and strong chemicals.
A.from
B.to
C.with
D.at
