单项选择题
The（）(折叠式舱盖) can fold slowly.
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（）(侧滚式舱盖) runs along the guide rail.
单项选择题 The（）(滚动式舱盖) runs along the guide rail.
单项选择题 The（）(自动舱盖) is operated by electric or hydraulic power.
