Quality standard of steel trusses 钢桁架质量标准
lattice steel trusses 格构式钢管桁架
continuous steel trusses 连续钢桁架
prestressed steel trusses 张拉预应力钢桁架
parallel-chord steel trusses 平行弦钢桁架
plane prestressed steel trusses 平面预应力钢桁架
space prestressed steel trusses 立体预应力钢桁架
prestressed spatial steel trusses 预应力空间钢荇架
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