15760709777
2025/6/3 來(lái)源:www.smt16.cn
普通方管每米計(jì)算公式:(長(zhǎng)+寬)*2*壁厚*0.00785 =每米重量,熱鍍鋅方管計(jì)算公式:(長(zhǎng)+寬)*2*厚度*0.00785*1.06=每米重量
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