单项选择题
A. only on deck B. only in holds C. both on deck and in holds D. All above.
The derrick is too high.（）it, please.A.HighB.TopC.Adjus...
单项选择题The derrick is too high.（）it, please.
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
