单项选择题
A.arranged as close to each other as possible to save space B.arranged far away from each other for convenient operation C.be fixed or clamped to avoid vibration D.kept easy removable as to convenient repairing work
The guard, fencing or shielding for moving parts or mac...
单项选择题The guard, fencing or shielding for moving parts or machinery can be removed for repair only when the machinery it belongs to（）
A.stays at rest B.is working stably C.is worn out D.is in good operation
Before starting an engine by air, the engine must（）A.be...
单项选择题Before starting an engine by air, the engine must（）
A.be turned by a turning gear for at least one minute B.be turned by a turning gear for at least two minutes C.be turned at least one complete turn D.be turned at least two complete turns
The oil pressure and flow from each bearings can be che...
单项选择题The oil pressure and flow from each bearings can be checked when（）
A.the lubricating pumps are stopped and the access doors are opened B.the lubricating pumps are running and the access doors are opened C.the engine is running and the access doors are closed D.the engine is stopped and the access doors are closed
