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简述电渣压力焊的施工程序.

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简述箍筋的下料长度怎么计算.

某梁的设计主筋为３根 HRB３３５级直径１８mm钢筋,今现场无该级钢筋,拟用 HRB４００级直径２０mm钢筋代换,试计算需几根?若用直径为１６mm钢筋代换,当梁宽为２５０mm时钢筋如何排列?

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