80例中晚孕正常胎儿主肺动脉与升主动脉的超声心动图对比分析
80례중만잉정상태인주폐동맥여승주동맥적초성심동도대비분석
Comparison analysis of 80 cases of late pregnancy fetal ultrasound of normal main pulmonary artery and the ascending aorta heartbeat
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