單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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In machinery space, the valves, pipes should be（）

你可能感興趣的試題

The guard, fencing or shielding for moving parts or machinery can be removed for repair only when the machinery it belongs to（）

Before starting an engine by air, the engine must（）