鍍 鋅 扁 管. 標準重量計算公式. [(長+寬)X2÷3.1416﹣厚度]X厚度X0.025=Kg/m. 10X20. 50X100X4.0. 13X26. 50X100X4.5. 15X30X1.35. 50X100X6.0. 20X40X1.2. 60X120X3.0.
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