单项选择题
Do you want the derrick adjusted （）?
A. up and down
B. upwards or downwards
C. upside or downside
D. forwards and backwards
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相关考题
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单项选择题
The safe working load of each derrick is five （）.
A.tones
B.tonnages
C.tons
D.dunnage -
单项选择题
All the （）in hold No.3 should be bagged.
A.sweep
B.sweeping
C.sweepings
D.dunnage -
单项选择题
I was told not to use （）in handling bagged cargoes.
A.blocks
B.hooks
C.cargo sling
D.derricks
