西气东输二线用X80级φ1219mm×22.0mm直缝埋弧焊管质量分析
서기동수이선용X80급φ1219mm×22.0mm직봉매호한관질량분석
Quality Analysis on X80 φ1219 mm×22.0 mm SAWL Pipe Used for 2nd West-east Gas Pipeline Project
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