... 超声波侦测器 ultrasonic detector 超声波频散 ultrasonic dispersion 超声回波 ultrasonic echo ...
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国外在这方面有较系统的研究，并提出了一种预测零频到超声波频率之间全部速度频散的分析技术。
It has been researched systematically on abroad, and an analysis technology was put forward to predict all the velocity's dispersive of frequency from zero to ultrasonic frequency.
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