助推器和发动机里面是固体燃料，烧完之后就是空壳。炮弹重但发射之后的弹壳就轻了许多

来源: 天青水蓝于 2025-05-10 15:54:04 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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