单项选择题
The（）(自动舱盖) is operated by electric or hydraulic power.
A. automatic hatch cover B. folding type cover C. hatch coaming D. side-rolling type cover
单项选择题 Are you testing the（）(液压舱盖)?
单项选择题 Please help me lift the broken （）(垫舱料).
单项选择题 I think you’d better use the （）(岸吊).
