单项选择题
The（）(滚动式舱盖) runs along the guide rail.
A. rolling type hatch cover B. side-rolling hatch cover C. folding type hatch cover D. automatic hatch cover
单项选择题 The（）(自动舱盖) is operated by electric or hydraulic power.
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).
