A.60% B.50% C.40% D.20% E.10%
A.妊娠囊 B.胎芽 C.胎心搏動(dòng) D.胎兒心臟結(jié)構(gòu) E.卵黃囊
A.胎盤老化 B.胎兒雙頂徑小于同孕期胎兒 C.胎兒皮下脂肪變薄 D.胎兒股骨長(zhǎng)度正常高于正常胎兒增長(zhǎng)值 E.胎兒臍帶動(dòng)脈S/D增多