Cross-check the main roof truss roof installation quality of the surface is not perpendicular to the vertical center two blocks;
屋架安装质量主要检查屋架跨中对两支座中心竖向面的不垂直度；
Cross-check the main roof truss roof installation quality of the surface is not perpendicular to the vertical center two blocks;
屋架安装质量主要检查屋架跨中对两支座中心竖向面的不垂直度；
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