單項(xiàng)選擇題

The derrick is too high.（）it, please.

A.High
B.Top
C.Adjust
D.Lower

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單項(xiàng)選擇題

The derrick is too low. （）it, please.

A.Lower
B.High
C.Top
D.Adjust

單項(xiàng)選擇題

Before the（）of the derrick, check all the tackle closely.

A.operation
B.operate
C.operated
D.operator