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80年前 XP-81原型机首飞 采用混合动力“超级堡垒”的护航战斗机
xp-81第二架原型机,实现最终的混合动力方案。 XP-81主要设计目的是为空袭日本的B-29“超级堡垒”重型轰炸机提供护航,所以设计指标就有续航里程 ...
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