选用有标记主位与句子需表达的某种修辞效果有关。
The use of a marked theme, which is selective, results from its certain rhetorical effects.
酶免疫分析技术的质量依赖于抗原的纯度、抗体的特异性、合适标记酶的选用，其灵敏度取决于标记酶的高度纯化和高转化率。
The quality of an enzyme immunoassays depends very much on the purity of the antigen or hapten used for conjugation, the specificity of the antibody and the choice of a suitable enzyme label.
实验结果表明，所选用的微卫星标记表现出丰富的多态性，可成功地应用于丝羽乌骨鸡的遗传分析。
The results suggested that the eighteen microsatellite markers could be successfully applied to the silkies genetic analysis.
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