某女士,30岁,已婚,生育一胎后欧打算采取避孕措施,由于丈夫不愿意使用避孕套,故...

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某女士,30岁,已婚,生育一胎后欧打算采取避孕措施,由于丈夫不愿意使用避孕套,故暂时采用安全期避孕法,结果避孕失败,再次妊娠、行人工流产术后,在义务人院劝导下宫内节育器,3年来月经周期正常,未再妊娠。宫内节育器的避孕原理以下哪一项是错误的

影响精子在女性生殖道内移行

影响精子和卵子的运行

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影响受精卵着床

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【单选题】本工程,下列因素中与普通钢筋混凝土保护层厚度无关的是 ( )

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