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波音XB-15与道格拉斯XB-19“实验性远程轰炸机”(第三部分)
当道格拉斯公司完成XB-19(序列号38-471)原型机的制造时,它已超越其前身波音XB-15,成为当时美国建造的最大飞机。在第二次世界大战结束之前,美国没有制造出比它更大的飞机。
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