发布时间:2025-02-02 07:06:49
圆管理重=(外径-壁厚)*壁厚*0.02466
如果上面的48是外径那么就是:
(48-2.5)*2.5*0.02466=2.805075
cad室内设计图纸中窗户旁边的lh92ch92th分别代表什么啊
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