短語詞組短語frictional l drag 摩擦阻力frictional and drag moment 摩阻力矩wind frictional drag 風(fēng)摩擦拖力frictional drag on belt 作用在皮帶上的摩擦曳力frictional drag coefficient 摩擦曳力系數(shù)frictional drag west bank 摩擦牽力negative frictional drag 負(fù)摩阻力skin friction frictional drag 壁剪應(yīng)力frictional drag of air 空氣的摩擦阻力;空氣摩擦阻力 返回 frictional drag