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断肠人:多谢老师解答;也就是说Vdc起辅助传输或切换的作用? (2015-12-17 14:23) 5XX)8gAo
foxman:说是 "电位或是准位" 设置比较贴切。 (2015-12-17 15:25) QKz2ONV=)