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【单选题】
关于紧急避孕下列哪项是正确的A.
对服药前72小时和服药后72小时的未采取避孕措施性交具有同样的避孕作用
B.
紧急避孕药也称事后避孕药，可于每次性交后服用
C.
紧急避孕药能使排卵延迟，服药后如不采取可靠避孕措施，很可能造成妊娠
D.
流产药可用于紧急避孕，其机制是催经流产
E.
紧急避孕药可防止宫外孕
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