单项选择题
A.High B.Top C.Adjust D.Lower
The derrick is too low. （）it, please.A.LowerB.HighC.Top...
单项选择题The derrick is too low. （）it, please.
A.Lower B.High C.Top D.Adjust
Before the（）of the derrick, check all the tackle closel...
单项选择题Before the（）of the derrick, check all the tackle closely.
A.operation B.operate C.operated D.operator
During the voyage, the derrick should be stowed （）.A. f...
单项选择题During the voyage, the derrick should be stowed （）.
A. fore B. aft C. fore and aft D. lowered
