单项选择题
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
（）are usually stowed both above and below deck.A.Contai...
单项选择题（）are usually stowed both above and below deck.
A.Containers B.Trucks C.Machinery D.Clamps
