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一般怀孕多少天查BC
更新时间: 2020-11-04 00:00:00  

一般在怀孕40天以上就可以查BC。B超可以说是在临床上应用最为广泛的影像学检查技术。B超是利用超声波的原理,对人体进行诊断的。说到超声波我们平时说话和唱歌的声音,它的频率在50至1万赫兹,我们把这个频段的声音称之为可听声,而当声波超过2万赫兹以上,人耳就听不到了,这就是超声波。

关键词: 一般 怀孕 多少 bc

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