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用人为的方法不使受孕,主动地控制生育称为避孕。避孕是实施计划生育的有效措施。避孕法可分为一般避孕法、药物避孕法和器具避孕法等,现将其中常用的具体方法分别简要介绍如下。 (一)安全期避孕 1、原理正常情况下,成年女性在每月只有一次排卵,即只有一个卵子成熟从
The artificial approach does not make conception, take the initiative to control birth is called contraception. Contraception is an effective measure to implement family planning. Contraceptive methods can be divided into general contraception, drug contraception and contraceptive methods, etc., which are now commonly used in specific methods are briefly described below. (A) of the contraceptive safety 1, the principle Under normal circumstances, adult women only once in a month ovulation, that is, only one egg mature from