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45度弯头怎么算 碳钢衬塑管道弯头 dn50 螺纹连接
30度的弯头转弯半径如何计算 ^圆环体2113积=2X3.14X3.14(r^2)Rr:圆环圆半5261径R:圆环回转半径中空管圆环体积=2X3.14X3.14((r^2)-(r’^41022))Rr’:圆环内圆半径90,165360,45...
30度的弯头转弯半径如何计算 ^圆环体2113积=2X3.14X3.14(r^2)Rr:圆环圆半5261径R:圆环回转半径中空管圆环体积=2X3.14X3.14((r^2)-(r’^41022))Rr’:圆环内圆半径90,165360,45...