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

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单项选择题

A. closed
B. opened
C. handled
D. opened and closed

单项选择题

A.caps
B.levers
C.hatch covers
D.hatches

单项选择题

A.滑车
B.导向滑车
C.千斤索
D.底脚滑车