About Wang Gaofeng
About CNPC Tubular Goods Research Institute
About Zhang Ke
About AVIC Xi’an Flight Automatic Control Research Institute
About Lu Jing
About Sales Co., Ltd., East China branch of SINOPEC
About Liu Yinglai
About CNPC Tubular Goods Research Institute
About Nie Xianghui
About CNPC Tubular Goods Research Institute
About Zhao Jinlan
About CNPC Tubular Goods Research Institute
About Wang Changan
About CNPC Tubular Goods Research Institute
About Xu Yan
About CNPC Tubular Goods Research Institute
About Ai Zhigang
About CNPC Tubular Goods Research Institute
About Rejiagong Gongyi
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About crack
About mechanical property
About steel pipe
About gold
About weld defect
About in-place test
About scanning electron microscope
About HF
About welding
About chemical analysis
About spectral analysis
About resistor
About 原因分析
About HFW(high frequency welding)pipe
About cracking
About gray spot
About Fuel cells
About Weld defect
About Heat exchangers,coolers
About Mortar,concrete
About Metallic materials
About Chemical analysis of inorganic substances in general
About Transportation,supply and storage of gas fuels
About Resistivity
About Pipe-line transportation
About 高周波
About 電気抵抗器
About 漏れ
About 原因分析