适用于妊娠早期的遗传筛查手段是
A.羊膜腔穿刺
B.绒毛活检
C.胎儿心动图
D.胎儿镜检查
正确答案是B
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Complete following sentence with a (compound) word derived from the one(s) given in bracket.
One ( ) of a carpenter is to have good tools, which add to his skill, confidence, and pleasure in owning them. (require)