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