Turn on the first for one min and then turn it off. . P. V% s' }3 }, GTurn on the 2nd for five min and then turn it off. & Y* l3 k4 ~% nTurn on the 3rd and leave it on.( J# [ u, C" Y1 x4 `
And then go upstairs right away.0 y; ]. Q+ `$ r+ D2 z- E4 }! Q% f4 a0 z8 W
`2 T8 Q8 Y& d" }: eFind the answer by using your fingers and eyes . }1 x( Q" d+ u' V% |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 * o4 u% R& q' c- c/ O" T
Turn on the first for one min and then turn it off. % J* D' C# d( W+ @$ I/ U( ^Turn on the 2nd for five min and then turn it off.. J* n8 ]. T7 F. D
Turn on the 3rd and leave it on. I5 d# }( y: C( w2 C) K2 u8 NAnd then go upstairs right away. 7 K$ ]! Y& P( V$ x2 [5 F2 g* h; S% m- f5 t; H+ ^! B4 O1 y
Find the answer by using ...