... 对焊连接（接头） Bull welding joint 螺纹连接；管螺纹连接 Threaded joint; pipe threaded joint 锥管螺纹密封焊连接 Seal-welded taper pipe threaded joint ...
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... 对焊连接（接头） Bull welding joint 螺纹连接；管螺纹连接 Threaded joint; pipe threaded joint 锥管螺纹密封焊连接 Seal-welded taper pipe threaded joint ...
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