单项选择题
A. slacked off B. send away C. taken in D. send out
Do you want the derrick adjusted （）?A. up and downB. up...
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
The safe working load of each derrick is five （）.A.tone...
单项选择题The safe working load of each derrick is five （）.
A.tones B.tonnages C.tons D.dunnage
All the （）in hold No.3 should be bagged.A.sweepB.sweepi...
单项选择题All the （）in hold No.3 should be bagged.
A.sweep B.sweeping C.sweepings D.dunnage
