Turn on the first for one min and then turn it off.+ Y! d2 [# y7 j$ t& E/ s
Turn on the 2nd for five min and then turn it off.* |- Y- w5 f7 j& q9 @
Turn on the 3rd and leave it on.. O _7 a3 v+ Y7 F
And then go upstairs right away. - H/ u9 K2 q0 u7 [- K$ a# y, x1 {. T+ E9 S
Find the answer by using your fingers and eyes& U1 H7 X |0 o& A+ N$ \- g: e L b
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 & H) a. M1 [6 t. V8 v8 HTurn on the first for one min and then turn it off.: H1 h4 {. X& h- p4 w# K/ c
Turn on the 2nd for five min and then turn it off. % B& P1 b6 r/ ?' |$ j7 m+ A5 GTurn on the 3rd and leave it on. 5 p8 T4 P! d* E' p1 Q) |And then go upstairs right away. + ^% U* ^: k7 S d s 6 y" s& }& U8 fFind the answer by using ...