单选题:5,7-二甲氧基黄酮的 题目分类:中药学专业知识(二) 题目类型:单选题 号外号外:注册会员即送体验阅读点! 题目内容: 5,7-二甲氧基黄酮的 A.1H-NMR中化学位移在12.50左右有吸收 B.1H-NMR中H-8比H-6在低场有吸收 C.1H-NMR中A环上没有芳香质子 D.1H-NMR中A环具有一个芳香质子 E.1H-NMR中A环质子具有ABX偶合系统 参考答案:【答案仅供学习,请勿对照自行用药等】 答案解析:
Passage One.听材料,回答下列各题:What were the scientists worried abou Passage One.听材料,回答下列各题:What were the scientists worried about soon after the G 分类:中药学专业知识(二) 题型:单选题 查看答案
Conversation Two.听材料,回答下列各题:What does the man want to do acc Conversation Two.听材料,回答下列各题:What does the man want to do according to the conv 分类:中药学专业知识(二) 题型:单选题 查看答案
Which of the following did the man agree to do? Which of the following did the man agree to do?A.He will postpone the trip. B.He 分类:中药学专业知识(二) 题型:单选题 查看答案
属于紫芝的性状特征的是 属于紫芝的性状特征的是A.皮壳坚硬,黄褐色或棕红色,有光泽 B.纵切面紫黑色 C.皮壳与菌柄表面紫黑色,有漆样光泽,菌肉锈褐色 D.皮壳外有大量粉尘样黄褐色孢子 分类:中药学专业知识(二) 题型:单选题 查看答案