相关考题
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单项选择题
Wire ropes should be greased （）.
A. every month
B. every two months
C. every three months
D. A or B -
单项选择题
The （）of the derrick is 5 tons.
A.GT
B.SWL
C.DWT
D.TDW -
单项选择题
Have you got （）lashing wires?
A.plenty
B.much
C.a lot
D.enough
