以下为句子列表：
英文: Cross-check the main roof truss roof installation quality of the surface is not perpendicular to the vertical center two blocks; Roof surface pressure chord of the roof truss vertical bending side, we must ensure that such errors do not exceed the allowab
中文: 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;屋架受压弦杆对屋架竖向面的侧面弯曲,必须保证上述偏差不超过允许偏差,以保证屋架符合设计受力状态及整体稳定要求.
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