two-component selection marker 两组分选择标记
Language is regarded as an ethnic and social marker, and also an important component of identity and culture for many groups.
语言是一个民族和社会的标记，也是许多群体身份与文化构成的一个重要方面。
Government bond, which is an important component in the bond marker, is the main form of government credit.
国债作为公债的重要组成部分，是国家信用的主要形式。
Objectives: To establish the technology for extracting cell-free fetal DNA in maternal plasma, comparing detection rate of fetal component marker SRY gene and RASSF1A gene.
工作目的：建立母血浆中胎儿游离dna分离提取的技术，利用SRY基因和RASSF1A基因检测胎儿游离dna，并比较它们的检出率。
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