指出了心音检测仪将逐步向数字化，多媒体化，智能化的发展趋势。
It is suggested that future heart sound detection instrument should be digitization, multimedia and intelligence to meet different application requirements.
介绍双频涡流检测传感器(检测线圈)的工作原理、设计和制作，以及与EEC - 35型智能全数字式多频涡流检测仪的联机调试。
The operation principle, design and development of two-frequency eddy current transducer, as well as its connection with EEC-35 full-digital multi-frequency eddy current instrument are described.
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