标准查询 标准查询船舶与海洋技术. 法兰管用金属阀. 面到面和中心到面的尺寸
Ships and marine technology - Metal valves for use in flanged pipe - Face-to-face and centre-to-face dimensions
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标准查询Ships and marine technology - Metal valves for use in flanged pipe - Face-to-face and centre-to-face dimensions
