roof surface meaning in Chinese

屋顶表面

On the basis of prantel boundary layer idea , wind sand fluid of irreducible rare phase as research object , by the foundation of general equation of wind sand fluid , in the condition of basic hypothesis , the boundary layer equation of car roof surface is set up and the boundary condition the fluid slippage character in solid wall surface is given
摘要基于普朗特的边界层思想，以不可简化成稀相的风沙流体为研究对象，以风沙流的一般方程为基础，在基本假设的条件下，建立了高速轿车车身顶部过流表面的边界层微分方程并给出沙流在近壁表面以滑移为特徵的边界条件。
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 allowable deviation to ensure roof stability and comply with the design requirements of the state by force
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