单项选择题
A.0.025mg/ml B.0.05mg/ml C.0.025μg/ml D.0.05μg/ml
A.5ml:12.5mg B.5ml:125mg C.5ml:125μg D.5ml:12.5μg
A.70-80h B.70-85h C.75-80h D.75-85h