[KongchangAI]
Unverified80% confidenceDecision RuleTime unknown

探头频率2MHz的多普勒探头穿透力强、适合捕捉较深或孕晚期胎心,3MHz更适合体型偏瘦或孕中期;胎心仪优选2MHz探头兼顾各孕周

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