pulse-echo中文什么意思

例句与用法

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1. Explain the characteristics of piezoelectric crystals and the factors relating to the resonant frequencies of a piezoelectric crystal , and the procedure of the pulse - echo method
   说明压电晶体的特性和与压电晶体的共振频率有关的因数，以及脉波回波法的过程。
2. The system is based on ultrasonic multiple pulse - echo principle , the control circuit of sonic circulation , can improve the precision of measurement by extending the time of detection
   本系统以超声波多次脉冲反射法测距原理为基础，设计声循环反射控制电路，达到以延长测量时间为代价提高测量精度的目的。