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取益母草膏(煎膏剂)约 10g ,置洁净干燥的 50ml 具塞锥形瓶中,精密称定,煎膏重量为 10.000g ,加入 20ml 纯化水,精密称定,煎膏与重量为 30. 000g ,混匀,作为供试品溶液。按比重瓶法测定,已知比重瓶重 23.000g ,充满供试品溶液共重 32. 000g ,充满共重 31.000g 。计算益母草膏的相对密度,并判断是否符合规定。药品标准规定 d ≥ 1.36 。
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