简述避孕的原理。
(1)阻止精子与卵子结合。(2)抑制排卵。(3)改变宫腔内环境,使其不适于受精卵植入和发育。
扫描二维码免费使用微信小程序搜题/刷题/查看解析。
版权声明:本文由翰林刷题小程序授权发布,如需转载请注明出处。
本文链接:https://doc.20230611.cn/post/996547.html
上一篇:如何理解影视时间?
下一篇:that, which, when; they, those, thatThere are occasions ____ psychiatrists have great difficulty in distinguishing between people who are mentally ill and ____ who are mentally healthy.