单项选择题
Do you want the derrick adjusted upwards or downwards? （）
A. Top the derrick. B. Yes, I do. C. No, I don’t. D. Sorry, I don’t know.
单项选择题 Bosun, I’ve never operated the hatch covers （）by hydraulic power.
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.
