That's why the new WZ-10 attack helicopter was delayed nearly a decade, and why there appear to be two different prototypes for the J-20 stealth fighter.
这正是新WZ - 10攻击直升机推迟了近十年面世的原因，也是J - 20隐形战机有两个不同原型机的原因。
Number 7. BELL AH-1 COBRA is a two-blade, single engine attack helicopter manufactured by Bell Helicopter.
第七名：贝尔的AH-1眼镜蛇是由贝尔直升机公司制造的双叶片，单发动机攻击直升机。
First, the simplified dynamics and kinematics model of attack helicopter air-combat are created, and the specific method on simplification of the model is given.
首先建立了简化的武装直升机空战动力学和运动学模型，阐明了模型简化的具体方法；
First, the simplified dynamics and kinematics model of attack helicopter air-combat are created, and the specific method on simplification of the model is given.
首先建立了简化的武装直升机空战动力学和运动学模型，阐明了模型简化的具体方法；
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