A thin membrane as an echogenic band stretching across the left atrium could be identified with echocardiography on the parasternal and apical long axis views;
胸骨旁及心尖长轴位心动超声图确定左房内异常隔膜形成的回声增强亮带；
Precision round hole and cylindrical grinding: ultra-long and ultra-thin axis grinding, with precision to 2, coaxial jumping within 2.
精密内、外园磨削：超长、超细轴磨削，尺寸精度达到2，同轴跳动2以内。
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