超音速升力线理论
supersonic lifting-line theory
改进升力线法
Improved lifting line method
普朗特升力线理论
prandtl lifting line theory
普朗特升力线性理论
Prandtel lifting-line theory
非线性脉动升力
nonlinear aerodynamics theory
升力涡线理论
lifting vortex line theory
直升机电力巡线
helicopter power line inspection