歼22的特点是低看得见，高机动性机身；先进的综合航空电子系统；与动力表现让超音速巡航无加力。
The F-22 is characterized by a low-observable, highly maneuverable airframe; advanced integrated avionics; and aerodynamic performance allowing supersonic cruise without afterburner.
由于在中速具有极好的可调整性，且相对高的制动力在慢速、磁力系统在困难的抛投环境下是相当不错的，比如逆风抛投。
Because of great middle-speed adjustability, and relatively high brake force at slow speed, magnet systems are quite good for difficult casting situations like casting against winds.
本文研究了平面多项式向量场的全局与局部分叉，旨在研究高次平面非线性动力系统多极限环的存在性以及极限环的个数及其相对位置关系；
The main aim of this dissertation is to study the exist of limit cycles of plane nonlinear dynamic system of high degree and the number and the configurations of limit cycles.
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