Turn on the first for one min and then turn it off.3 T2 A; Q1 u$ }4 j7 D" E$ Y
Turn on the 2nd for five min and then turn it off. ! J3 ~# c* u* m# N3 j' PTurn on the 3rd and leave it on.1 a }8 i) V) V( r0 I
And then go upstairs right away. * \0 m6 V0 x; ^! A- _$ |' k% d7 u% i- }5 Q* T+ \' [+ O
Find the answer by using your fingers and eyes! }, D& v7 C; r
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 ' D% }5 {. Z, y6 [% g
Turn on the first for one min and then turn it off.1 ^8 T& [! k7 V
Turn on the 2nd for five min and then turn it off. ; Q. a$ ]! z) jTurn on the 3rd and leave it on. : G- d+ g5 A* z [8 X5 MAnd then go upstairs right away. $ h# P' H' p3 E" b0 ] : T/ V) V7 T- HFind the answer by using ...