Turn on the first for one min and then turn it off. 1 S& E% f$ L2 Q1 N) b. q" r* DTurn on the 2nd for five min and then turn it off. % t3 G$ Y; E" d, R# |# y/ b2 I. NTurn on the 3rd and leave it on.7 F+ M0 s8 n1 _& n
And then go upstairs right away.+ K, m$ ~9 X) P. @% @! u
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Find the answer by using your fingers and eyes% E9 G% s# i; b" S+ W! F4 @, Y% U
这只是一个智力问题,不象是电工问题。
原帖由 老警察 于 2009-1-16 07:12 发表 2 K" A( [7 `# [' K+ u* iTurn on the first for one min and then turn it off. 9 k. I. j- M+ GTurn on the 2nd for five min and then turn it off. 7 A! H1 S# q: [& gTurn on the 3rd and leave it on. 8 N. N0 ~ H* y. i1 EAnd then go upstairs right away.1 F& G8 P: k p' a$ ?( H0 X% a
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