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
单项选择题 When the weather becomes bad, the hatch covers will be （）(关闭).
单项选择题 Don’t operate two or more （）(舱盖)at the same time.
单项选择题 lead block（）
