单项选择题
In machinery space, the valves, pipes should be（）
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
相关考题
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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 -
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 -
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
