发布时间:2025-01-25 02:24:45
用混泥土钢筋框架结构,底层除四周要用红砖外,中间只有立柱,让底层空间大,方便做生意……二楼就和常规一样设计
请问各位高手10米跨度固定龙门架起重量3吨用多大工字钢还用焊接结构架吗
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