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【单选题】

[单选,B1型题] 龙胆苦苷是()

A.
单萜
B.
二萜
C.
环烯醚萜醇
D.
环烯醚萜苷
E.
裂环环烯醚萜苷
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题目标签:龙胆苦苷单选
参考答案:
参考解析:
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【单选题】分离龙胆苦苷四乙酰化物和獐芽菜苷四乙酰化物用

A.
AgNO3硅胶柱色谱
B.
60%~65%H3PO4
C.
吉拉尔试剂
D.
氧化铝柱色谱
E.
硅胶柱色谱

【单选题】龙胆苦苷是()

A.
单萜
B.
二萜
C.
环烯醚萜醇
D.
环烯醚萜苷
E.
裂环环烯醚萜苷

【单选题】What is the main aim of book review? (单选)

A.
analyzing a perspective or argues a point
B.
analyzing or discussing researches previously published by others
C.
summaries and comments on a newly published academic book
D.
summaries, reviews and comments the research trends, the major discoveries, significant findings, the leading opinions on a particular subject.

【单选题】单选-考题A75

A.
调整电视对比度
B.
更改笔记本的分辨率
C.
关闭电视重新打开
D.
调整电视亮度