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随便看	ultrasonic pulse method ultrasonic pulse nonlinear propagation ultrasonic pulse transmission method ultrasonic pulse velocity ultrasonic pulse velocity measurement device ultrasonic pulse velocity method ultrasonic puncture ultrasonic purification ultrasonic Q-switch ultrasonic Q-switching ultrasonic quantity ultrasonic quartz ultrasonic radar ultrasonic radiation ultrasonic radiation force ultrasonic radiator ultrasonic rail fault detection device ultrasonic rail flaw detection ultrasonic rail tester ultrasonic rail-testing train ultrasonic rangefinder ultrasonic range finder ultrasonic range measurement ultrasonic range sensor ultrasonic ranging