相关考题
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单项选择题
A （）can give power to hoist or lower cargo.
A. cargo winch
B. lift winch
C. derrick
D. crane -
单项选择题
Rubbish can be thrown into the water （）.
A. in a harbour
B. in any place
C. 25 miles off the land
D. 10 miles off the land -
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
