Ultrasonic sounds produce pulsed signals, 【by means of which】 various defects in metal can be detected.超声波能产生脉冲信号,利用这一信号,金属中的缺陷可以被探测出来.利用信号能探测出金属中的缺陷,个人...
Ultrasonic sounds produce pulsed signals,______ various defe
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