财联社8月6日电,美国“防务一号”(Defense One)网站援引消息人士的话报道,美国打算通过更换发动机和雷达来改进20世纪60年代的战略轰炸机B-52“同温层堡垒”(B-52 Stratofortresses),这可能花费至少150亿美元。
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