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Test surfaces are usually rough in ultrasonic flaw detection.
在超声探伤中，经常遇到测试面较粗糙。
youdao
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You must test the frequency of ultrasonic everyday when you turn on the machine.
每天开机时，必须检测超音波频率。
youdao
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You must test the frequency of ultrasonic everyday when you turn on the machine.
每天开机时，必须检测超音波频率。
youdao