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指出了钢管接触式超声波探伤时选择探头应注意的问题，并指出了磨制探头抓及测试孤面探头折射角的方法。
The problems that should be paid attention to when choosing the probe in the steel tube contact ultrasonic flaw detection are pointed out, and the method of grinding the probe and testing the refracting angle of the probe is also pointed out.