Turn on the first for one min and then turn it off. % Y+ K! y* }( o( p5 Z- ?$ H HTurn on the 2nd for five min and then turn it off. 2 ~+ m" u1 O0 F# z" b; pTurn on the 3rd and leave it on. $ ?$ v. G4 k8 k" CAnd then go upstairs right away.* y0 C) x3 B3 l. J( }* s
3 m& U$ U. i* T3 a ?8 P1 k/ gFind the answer by using your fingers and eyes 3 j$ ]6 c; | g. }5 @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 ) b. x, t; I/ \: |# H% \Turn on the first for one min and then turn it off." ^4 R' M J0 J/ m3 A
Turn on the 2nd for five min and then turn it off. c+ R! l+ p1 P S% Z
Turn on the 3rd and leave it on.4 L: P, w* q6 k8 e( ?6 E5 a
And then go upstairs right away.' `+ @' ]% ~$ M- E- }
1 L8 _9 K8 e- y. ~7 _
Find the answer by using ...