单项选择题
A. derrick B. crane C. jumbo boorn D. special crane
You should release the （）(重型螺栓)on top of the cover.A. l...
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
The sailor should （）(报告)it to the duty officer.A.report...
单项选择题The sailor should （）(报告)it to the duty officer.
A.report B.ask C.tell D.speak
The running wheel runs along the （）(导轨)on the hatch coa...
单项选择题The running wheel runs along the （）(导轨)on the hatch coaming top.
A. guide rope B. guide rail C. side coaming D. side roller
