单项选择题
Bosun, I’ve never operated the hatch covers （）by hydraulic power.
A.powered B.driven C.moved D.opened
单项选择题 When the weather becomes bad, the hatch covers will be （）.
单项选择题 After operation, drop the control levers into stowing hole, and （）the electric motor.
单项选择题 Don’t operate two or more hatch （）at the same time.
