目的：探讨胎儿期心内膜垫缺损(ECD)的超声特征，分析诊断中存在的问题，以提高其产前超声诊断率。

Objective To evaluate the sonographic feature of endocardial cushion defect (ECD) in fetus, also analyze the problems and improve diagnostic ratio of this kind of defects.

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同时，对房地产前期定位策划的主要内容、研究的方法、步骤、具有的作用和地位、目前存在的问题等进行了深入的分析。

At the same time, the main content, research method and step of real estate preliminary planning and its function and status and the question existing have deeply analysed at present.

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