铜的需求主要在什么方面？现在通讯都用光纤了

来源: 灌木于 2010-04-06 23:54:18 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

WENXUECITY.COM does not represent or guarantee the truthfulness, accuracy, or reliability of any of communications posted by other users.