yob_ye1 发表于 2007-9-25 09:38 楼上的解释还是让人迷惑, 上拉下拉只是把电平拉高或拉低,但也不是差分啊,譬如两个同样的信号他们就是被 ...
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Table
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Autotypeset Left Center Right
FloatLeft FloatRight Orderedlist Unorderedlist
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