茶碱的有效血浆浓度范围是A:1~5μg/ml B:0.05~1μg/ml C:5~20μg/ml D:20~30μg/ml E:30~40μg/ml

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问题 茶碱的有效血浆浓度范围是

选项 A:1~5μg/ml
B:0.05~1μg/ml
C:5~20μg/ml
D:20~30μg/ml
E:30~40μg/ml

答案C

解析
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