In order to meet the requirment of producement improved Butt Joint Radioscopy Procedure, and required satifac-tory effects.
为了满足生产需要对椭圆封焊缝射线探工艺行改,得了满意效果。
In order to meet the requirment of producement improved Butt Joint Radioscopy Procedure, and required satifac-tory effects.
为了满足生产需要对椭圆封焊缝射线探工艺行改,得了满意效果。
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