单项选择题
A. in a harbour B. in any place C. 25 miles off the land D. 10 miles off the land
The jumbo boom can （）.A. lift heavy cargoB. load and un...
单项选择题The jumbo boom can （）.
A. lift heavy cargo B. load and unload C. join ropes together D. lift light cargo
We are （）the cargo wire.A.greasingB.greaseingC.greasedD...
单项选择题We are （）the cargo wire.
A.greasing B.greaseing C.greased D.greaser
Containers are loaded and discharged by（）.A. heavy derr...
单项选择题Containers are loaded and discharged by（）.
A. heavy derrick B. special cranes C. fork trucks D. winch
