DIN EN 12982-2005 工业阀门 末端对末端和中心对末端尺寸Industrial valves - End-to-end and centre-to-end dimensions for
标准简介
DIN EN 12982-2005 工业阀门 末端对末端和中心对末端尺寸Industrial valves - End-to-end and centre-to-end dimensions for butt welding end valves
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