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B超检查最早在孕______周可见妊娠环，超声Doppler检查最早在______周时能听到胎心音。
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B超检查最早在孕______周可见妊娠环，超声Doppler检查最早在______周时能听到胎心音。
时间：2021-12-29 03:26
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内科学
广西临床住院医师规范化培训
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