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单项选择题

欲配制500mg L(0.05%)含氯消毒剂1000ml,需要5%含氯消毒液多少ml?()……

欲配制500mg/L(0.05%)含氯消毒剂1000ml,需要5%含氯消毒液多少ml?()

A.5ml
B.10ml
C.15ml
D.20ml