现在国际铜价飙升，空调等行业都在实行铝代铜。一直用铜做子弹弹壳的美国，也会不可避免地用钢和铝制造子弹弹壳。

来源: thore 于 2026-01-10 19:14:43 [旧帖] [给我悄悄话] 本文已被阅读：次

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