单项选择题
A.caps B.levers C.covers D.coamings
（）-speed operation and rough handling of covers are dan...
单项选择题（）-speed operation and rough handling of covers are dangerous.
A.Low B.High C.Slow D.Quick
In order to avoid shock, reduce the speed by （）.A. cont...
单项选择题In order to avoid shock, reduce the speed by （）.
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
