... long welding neck 长高径法兰 ring joint welding neck flange 梯形槽式密封面对焊法兰 ; 环槽式密封面对焊法兰 raised face welding neck flange 凸面对焊法烂 ...
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... rail-end welding轨端补焊 raised face welding neck flange凸面对焊法兰 raised welding method上升焊接法 ...
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