发布时间:2025-01-18 21:05:43
镀锌钢材的价格大概是6元/米,4mm厚的钢材理论重量为31.4kg/m2,40*4的扁钢是0.04m2/米,所以价格为0.04*31.4*6元/米,算出来是7.536元/米
德国蓝天使生态标签deuz 76产品组建筑和家具面板哪些实验室测试报告是被认可的
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