川气东送大口径厚壁直缝埋弧焊管国产化国内外对比
천기동송대구경후벽직봉매호한관국산화국내외대비
Comparing Large Bore and Thick Longitudinal Submerged-Arc Welded Pipe for Gas Transmission from Sichuan to the East at Home with that at Abroad
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