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今将“一机部石油化工机械行业”于七三年七月六是在兰州召开的“超声波探伤经验交流会”上，交流的六种焊缝超声波探伤方法简介如下。
At present, “a mechanized petrochemical machinery industry” in July July 7 is held in Lanzhou “ultrasonic flaw experience exchange meeting”, the exchange of six kinds of weld ultrasonic flaw detection method is as follows.