黄酮类化合物结构中,2,3位碳间无双键的是
A.二氢黄酮
B.二氢黄酮醇
C.二氢异黄酮
D.黄酮醇
E.二氢查耳酮
参考答案:A,B,C,D
家族性腺瘤息肉病为
A."铅管"征B."鹅卵石"征C."鸟嘴"征D."杯口"征E.充盈缺损
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