怎么看螺纹钢是几级钢筋~~~建房柱头和梁柱用几级螺纹钢好~~
2025-01-18 08:08:18 2025-01-18 08:08:18 2025-01-18 08:08:18 2025-01-18 08:08:18做一节长为16米宽和高都是10厘米的铁皮通风管至少需要铁皮多少平方厘米
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