发布时间:2025-02-08 21:38:43
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
最近家里墙角下出现了一些偏黄色的小虫子 不确定是不是书蚤很小家里刚刚新装修一年麻烦帮我看一下
2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43我的自行车圆孔锁钥匙弄丢了打不开他们说把锁弄坏可我没工具怎么才能快速破坏
2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43 2025-02-08 21:38:43