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
— Mr. Wang, can you tell me ?
—www.hledu.net will help you.
A. why I can get the latest news about education
B. where can I search for the information about high schools
C. where I can find out the exam scores
