單項(xiàng)選擇題

Don’t operate two or more hatch （）at the same time.

A.caps
B.levers
C.covers
D.coamings

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單項(xiàng)選擇題

（）-speed operation and rough handling of covers are dangerous.

A.Low
B.High
C.Slow
D.Quick

單項(xiàng)選擇題

In order to avoid shock, reduce the speed by （）.

A. control level
B. control panel
C. inching control
D. low speed