A.75%酒精 B.500mg/L含氯消毒液 C.1000mg/L含氯消毒液 D.2000mg/L含氯消毒液
A.500mg/L B.1000mg/L C.1500mg/L D.2000mg/L
A.1-2 B.2-3 C.2-4 D.3-4