单选题The guard, fencing or shielding for moving parts or machinery can be removed for repair only when the machinery it belongs to（）Astays at restBis working stablyCis worn outDis in good operation
单选题
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
参考解析
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