平喘药茶碱安全、有效的血药浓度是（）查看材料A.1-5μg/ml B.5-10ng/ml C.5-20μg/ml D.0.5-1ng/ml E...

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问题平喘药茶碱安全、有效的血药浓度是（）查看材料

选项 A.1-5μg/ml B.5-10ng/ml C.5-20μg/ml D.0.5-1ng/ml E.20-40μg/ml

答案 C

解析

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