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【多选题】
氯化消毒剂与饮用水接触30min后,游离性余氯含量为0.5mg/L,通常情况下表明:A.
消毒过程完成
B.
达到满意的消毒效果，饮用水在流行病学上安全
C.
饮用水具有持续杀菌能力
D.
可以防止供水过程中的二次污染
E.
水中不存在微生物
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