单项选择题
A.start B.stop C.move D.shift
（）(高速)operation and rough handling of covers are danger...
单项选择题（）(高速)operation and rough handling of covers are dangerous.
A.High-speed B.Low-speed C.Slow-speed D.Quick-speed
In order to avoid shock, reduce the speed by （）(低速控制器)w...
单项选择题In order to avoid shock, reduce the speed by （）(低速控制器)when the cover comes near the stoppers.
A. control lever B. control panel C. control loop D. inching control
When the weather becomes bad, the hatch covers will be ...
单项选择题When the weather becomes bad, the hatch covers will be （）(关闭).
A. closed B. opened C. handled D. opened and closed
