Conclusion: it's effective to decrease the birth of fetal chromosomal abnormality by undergoing prenatal screening and diagnose with mother serum biochemical indicator in the second trimester.
结论孕中期应用母血清生化指标进行产前筛查，结合产前诊断是减少染色体异常患儿出生的有效方法。
Based on the attribute reduction of rough set, from different aspects, this paper sets up indicator screening model based on rough set.
基于粗糙集的属性约简原理，本文从不同的角度建立了基于粗糙集的指标筛选模型。
The study on the validity, reliability and control effect of the screening method of regarding water contact as chemotherapy indicator was carried out in schistosomiasis medium endemicity.
在血吸虫病中度流行区，对以疫水接触史确定化疗对象的筛检方法进行了其真实性和可靠性研究，并对其防治效果进行了纵向观察。
The study on the validity, reliability and control effect of the screening method of regarding water contact as chemotherapy indicator was carried out in schistosomiasis medium endemicity.
在血吸虫病中度流行区，对以疫水接触史确定化疗对象的筛检方法进行了其真实性和可靠性研究，并对其防治效果进行了纵向观察。
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