西方的现代化机械设备传入中国前清朝乾隆年间能修这个泸定桥也不简单，那铁索的冶炼水平也不错

来源: rmny 于 2026-01-17 19:58:24 [旧帖] [给我悄悄话] 本文已被阅读：次

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