单项选择题
The running wheel runs along （）on top of the hatch coaming.
A. the guide rail B. the guide rope C. the side coaming D. the guide roller
单项选择题 Could you show me （）to open the hatch covers?
单项选择题 If the hatch cover does not move, （）should be checked.
单项选择题 To ensure the safety in operating hatch covers, oil the moving parts （）.
