单项选择题

文体活动用品、玩具每周1-2次,预防性消毒浓度和时间()

A.100mg/L-250mg/L含氯擦拭或浸泡,消毒10-30min
B.250mg/L-500mg/L含氯擦拭或浸泡,消毒10-30min
C.500mg/L-1000mg/L含氯擦拭或浸泡,消毒10-30min