发布时间:2025-02-03 13:45:45
40*4扁钢的理论重量为1.256KG/M,镀锌扁钢的重量应该计算增加镀锌层后的重量(3%~6%),按照中间值增加4.5%时,既为1.256*1.045=1.313KG/M。
skyworth 创维 55h5m 液晶电视 55英寸 4k详细介绍
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