The guard, fencing or shielding for moving parts or machinery can be removed for repair only when the machinery it belongs to（）<br>A:stays at rest<br>B:is working stably<br>C:is worn out<br>D:is in good operation

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

出自：海船船员证

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