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【单选题】
下列化合物的醇溶液中加入少许镁粉,再添加几滴浓盐酸,出现微红色或红色,除了:
A.
异黄酮
B.
黄酮
C.
二氢黄酮
D.
黄酮醇
E.
二氢黄酮醇
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A.
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B.
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C.
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D.
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A.
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B.
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A.
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B.
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