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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

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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
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When the weather becomes bad, the hatch covers will be （）(关闭).

A. closed
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D. opened and closed
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Don’t operate two or more （）(舱盖)at the same time.

A.caps
B.levers
C.hatch covers
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