3．1．2富集培养 富集培养（enrichment culture）或选择培养（elective culture），就是利用微生物性状上的差异，给与某些生长条件，从而增殖该条件下而生长的微生物。
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Social and culture elective 社会文化选修
To learn more about Chinese culture, Jack has decided to take Chinese folk music as an elective course.
为了更多地了解中国文化，杰克决定选修中国民间音乐。
Elective course is main position or ways for undergraduate culture quality education.
高校选修课是对大学生进行文化素质教育的主阵地、主渠道。
This is the first time for mainland to try to compile elective textbooks on culture treatise.
这是中国大陆首次尝试编辑“文化论著研读”类选修教材。
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