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为消除盐酸地尔硫缓释胶囊释放度试验中空胶囊的干扰，对几种滤膜进行筛选，确认0．8μm微孔滤膜效果较为理想。
In order to eliminate the interference of diltiazem hydrochloride sustained-release capsules release experiment, several filters were screened to confirm that 0.8μm microporous membrane was more effective.