电气设备发生火灾时,一般情况下第一步应立即()
A、选用不导电灭火剂灭火
B、选用黄砂灭火
C、切断火源
D、切断电源
参考答案:D
测量回路中有短路或断路点仪表盘上()。
A.没变化
B.不指示或不稳定
C.变大
D.变小
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