About Liu Zhichao
About Tianjin Entry-Exit Inspection and Quarantine Bureau
About Zhu Jinbo
About Tianjin Entry-Exit Inspection and Quarantine Bureau
About Li Xuejun
About Tianjin Entry-Exit Inspection and Quarantine Bureau
About Yao Jiuhong
About Tianjin Entry-Exit Inspection and Quarantine Bureau
About Ma Hui
About Tianjin Entry-Exit Inspection and Quarantine Bureau
About Rejiagong Gongyi
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About mechanical property
About toughness
About steel pipe
About impact test
About hardening(heat treatment)
About radial direction
About tempering
About 管壁
About 衝撃破壊
About 機械的性能
About WB36
About thick wall
About impact properties
About mechanical properties
About Mechanical properties
About 焼入
About 焼戻し
About 厚
About 肉
About 鋼管
About 動径
About 力学性能
About 解析