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【单选题】
[单选,B1型题] Ⅱ型柴胡皂苷具有（）
A.
△12齐墩果烷结构
B.
13β . 28-环氧醚键结构
C.
同环双烯结构
D.
异环双烯结构
E.
齐墩果酸结构
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【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.
相关题目：
【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.
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