单项选择题
A. bagged cargo B. delicate cargo C. cased cargo D. non-packed cargo
The（）（吊杆）at hatch No.3 is in trouble.A.winchB.craneC.de...
单项选择题The（）（吊杆）at hatch No.3 is in trouble.
A.winch B.crane C.derrick D.gantry
To avoid shock ,you should reduce speed by（）（低速）control...
单项选择题To avoid shock ,you should reduce speed by（）（低速）control.
A. low speed B. high speed C. inching D. slow speed
This is a（）（侧滚动）type hatch cover.A.foldingB.rollingC.si...
单项选择题This is a（）（侧滚动）type hatch cover.
A.folding B.rolling C.side-rolling D.unfolding
