单项选择题
A. The lost B. The used C. The deformed D. The small
Four （）are needed to work this heavy derrick.A.winchesB...
单项选择题Four （）are needed to work this heavy derrick.
A.winches B.gears C.windlass D.cranes
This （）was repaired in Singapore.A. damaged derrickB. d...
单项选择题This （）was repaired in Singapore.
A. damaged derrick B. damaging derrick C. derrick to be damaged D. derrick
Push the “Oil Jack” position （）until the cover comes to...
单项选择题Push the “Oil Jack” position （）until the cover comes to its final closed position.
A.lifted B.lowered C.opened D.closed
