Turn on the first for one min and then turn it off. + R! R* B( _; J5 K+ X4 RTurn on the 2nd for five min and then turn it off. * I9 ?+ b- V$ BTurn on the 3rd and leave it on. 7 R/ n( L0 T' L% D* W( g; B8 ~And then go upstairs right away. + ~+ f M4 |) v, q5 r9 Z0 m 2 H% ~5 v x7 S/ \, NFind the answer by using your fingers and eyes8 _2 ~' G+ {" @2 P1 C5 l% E
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 $ L8 d' y% v! C9 Z% a8 y% _Turn on the first for one min and then turn it off. + g* y: N( u# y" e. K4 z1 H. oTurn on the 2nd for five min and then turn it off. 3 w" A2 x5 z V% aTurn on the 3rd and leave it on. + ?6 j3 {. g. ^, BAnd then go upstairs right away.$ U9 l: T: |5 N* l! Q. e
* h7 y6 ]# q' N: e7 y: VFind the answer by using ...