单项选择题
A. control level B. control panel C. inching control D. low speed
According to the customs of the port, hatch covers are ...
单项选择题According to the customs of the port, hatch covers are to be operated by （）.
A.stevedores B.watchmen C.winchmen D.foremen
（）lashing bar needs renewing.A. The lostB. The usedC. T...
单项选择题（）lashing bar needs renewing.
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
