“chorionic villus sampling”的概念、定义、翻译、参考文献-科学参考

单词	chorionic villus sampling
释义	chorionic villus sampling Encyclopedia 医学绒毛膜取样释 chorionic villus sampling; CVS绒毛膜取样在B超引导下经宫颈或腹部行穿刺术，抽取胎盘边缘的叶状绒毛膜组织、胎儿绒毛膜组织及脱氧核糖核酸（DNA）主要用于高风险胎儿的产前遗传学诊断的技术。是一项胎儿检材取样技术，也是侵入性产前诊断取材技术的一种。
随便看	positive definite form positive definite function positive definite functional positive definite Hermitian matrix positive definite inner product axiom positive definite kernel positive definite matrix positive definiteness positive definite operator positive definite potential positive definite product positive definite quadratic form positive definite scalar product positive definite sequence positive definite solution positive definite space positive definite tensor positive definte rational fanction positive deviation positive diffeomorphism positive diffeomorphisms positive differential positive direction positive displacement compressor positive displacement flowmeter

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