EN764-1中3.18的nominal size是什么意思? 我目前刚开始学习E文版的EN764,764-1的3.18 nominal size numerical designation of size which is common to all components in a piping system other than components indicated by outside diameters or by thread size. It is a convenient round number for reference purposes and is only loosely related to manufacturing dimensions 这一句如何翻译啊?望高人解答 [ ]查看更多4个回答 . 4人已关注