单项选择题
Are you testing the（）(液压舱盖)?
A. hydraulic hatch cover B. hydraulic release unit C. hydraulic oil jack D. automatic hatch cover
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).
单项选择题 Please help me （）(解开) the guy.
