双翼面—滑翔机机架上下两面被翼布包裹，以减少阻力和提高性能。
DOUBLE surface - glider with upper and lower sail surfaces that enclose airframe to reduce drag and improve performance.
计算分析了挖沟机在受到牵引力、海流力、土壤阻力等多种载荷作用下的可靠性。
Computing and analyzing the reliability of ditch digger under many loads, such as the pull, the drag of ocean current and the edaphic drag.
而转向半径、转向力矩和转向阻力矩的大小是衡量装载机转向性能的重要性能指标。
They are important data to judge steering function of loader such as steering radius, force moment of resistance and moment of steering.
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