单项选择题
When the derrick is topped, the guy must be （）(放松).
A. slacked off
B. sent away
C. sent out
D. taken in
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相关考题
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单项选择题
A （）(重吊杆)is used for lifting long heavy cargo.
A. derrick
B. crane
C. jumbo boorn
D. special crane -
单项选择题
You should release the （）(重型螺栓)on top of the cover.
A. lock in
B. heavy bolt
C. socket
D. heavy cleat -
单项选择题
The sailor should （）(报告)it to the duty officer.
A.report
B.ask
C.tell
D.speak
