单项选择题
The safe working load of the derrick is ().
A.5 tons
B.5 metres
C.5 feet
D.5 years
点击查看答案&解析
相关考题
-
单项选择题
It’s going to rain. Don’t forget ()the hatches.
A. to close
B. to open
C. to close and open
D. closing -
单项选择题
The crane is (). Could you ask somebody to repair it?
A. work well
B. good
C. out of order -
单项选择题
The sailor on duty is ()the derrick now.
A.doing
B.adjusting
C.working
D.working on
