如B21是六代B2是五代B1B是四代B52是三代，那一代二代又在哪？分代是从喷气机开始的，总不能把螺旋桨的B29算二代吧

来源: 天青水蓝于 2025-10-24 14:32:41 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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