... arch roof of ferro-cement 钢丝网水泥拱形屋架 arch roof truss 拱形屋架 arch tube 拱形管，形成炉拱的水管 ...
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arch-shaped roof truss 拱形屋架
arch bar roof truss 拱板屋架
cast-in-place arch-slab roof truss 现浇拱板屋架
roof truss of arch slab 拱板屋架
roof truss with arch bar 拱板屋架
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