Measuring thickness by ultrasonic pulse - echo contact method 接触式超声波脉冲回波法测厚
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Standard practice for measuring thickness by manual ultrasonic pulse - echo contact method 用人工超声脉冲回波接触法测量厚度的标准实施规程
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Standard test method for measurement of ultrasonic attenuation coefficients of advanced ceramics by pulse - echo contact technique 用脉冲反射接触技术测量高级陶瓷超声衰减系数的标准试验方法