材料和精密加工。谁都知道这两样最难。不是一天两天能赶上。这回被逼无奈，也许能安下心来慢慢发展了。谁知道。

来源: greenoasis 于 2019-06-02 09:40:53 [旧帖] [给我悄悄话] 本文已被阅读：次

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