A.①受血儿小,心脏小,羊水少,羊膜囊间隔膜薄,仅见两条脐血管②受血儿大,1/4胎儿有水肿,10%~25%胎儿有胸腔积液.腹水,心包积液,多数肌张力低,羊水多 B.②受血儿大,1/4胎儿有水肿,10%~25%胎儿有胸腔积液.腹水,心包积液,多数肌张力低,羊水多④供血儿小,心脏小,羊水少,羊膜囊间隔膜薄,仅见两条脐血管 C.①受血儿小,心脏小,羊水少,羊膜囊间隔膜薄,仅见两条脐血管④供血儿小,心脏小,羊水少,羊膜囊间隔膜薄,仅见两条脐血管 D.②受血儿大,1/4胎儿有水肿,10%~25%胎儿有胸腔积液.腹水,心包积液,多数肌张力低,羊水多③供血儿大,1/4胎儿有水肿,10%~25%胎儿有胸腔积液.腹水,心包积液,多数肌张力低,羊水多