回复：那个４＋６也是电阻是分散学生注意力的。

来源: 鸡毛蒜皮于 2013-12-13 10:47:12 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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回复：那个４ ＋ ６ 也是电阻是分散学生注意力的。