单项选择题
A.75%酒精B.清水C.500mg/L含氯消毒液D.1000mg/L含氯消毒液
A.1hB.2hC.3hD.4h
A.0.5B.2C.1D.1.5
A.1hB.2hC.3hD.1.5h
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