单项选择题
A.50mg/24h B.100mg/24h C.120mg/24h D.140mg/24h E.150mg/24h
A.pH4.5~5.5 B.pH5.5~6.5 C.pH6.0~6.5 D.pH6.5~7.5 E.pH7.5~8.5
A.甲苯 B.4%甲醛 C.麝香草酚 D.10%盐酸 E.浓盐酸