单项选择题
A.5mg/kg B.10mg/kg C.50mg/kg D.100mg/kg
A.10% B.13.5% C.15.5% D.10.5%
A.17.5%~18.0% B.18.5%~20.0% C.15.5%~17.0% D.17.0%~18.0%
A.17.5%~18.0% B.18.5%~20.0% C.15.5%~17.0% D.10.5%~13.0%
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