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I do not think you have discribed the question properly. And "两个开关,一个只能把灯打开,另一个只能把灯关上" is mission impossible. :-) I wanna know who asked you to do this? What's the context?

expertune (专家 GUID)
(#333187@0)
2002-1-13 -04:00
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Back To Topic: 电子工程师请注意了,请教一个初级问题。

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