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引言超声心动图是一门年青的科学。在过去20年中,这一技术得到了发展,目前已被试用于诊断大多数心脏疾病。对许多病理状态的诊断标准正在建立之中。在诊断的各个领
Introduction Echocardiography is a young science. This technology has evolved over the past two decades and has now been tried out to diagnose most heart diseases. Diagnostic criteria for many pathological conditions are under development. Each collar in the diagnosis