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【单选题】
甘草的化学成分主要有三萜皂苷类和黄酮类、香豆素类、多糖、生物碱、氨基酸等。三萜皂苷类主要有( )A.
甘草、甘草次酸
B.
甘草素、甘草
C.
异甘草苷、新甘草苷
D.
异甘草素、甘草次酸
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