B21空重差不多是J20兩倍，造價差不多7倍。B21要裝多少主動導彈防禦來應對2-3架J20圍攻呢。

來源: 監考老師於 2024-02-12 13:23:12 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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