单项选择题
A.接地 B.绝缘 C.直流 D.交流
A、先采用含氯或含溴消毒剂1000mg/L~2000mg/L浸泡30min~45min B、有明显污染物时应采用含氯消毒剂2500mg/L~5000mg/L浸泡至少60min C、有明显污染物时应采用含氯消毒剂5000mg/L~10000mg/L浸泡至少60min D、先采用含氯或含溴消毒剂500mg/L~1000mg/L浸泡30min~45min E、以上都不对
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