Turn on the first for one min and then turn it off. 6 F# `$ b6 \7 W2 ]( FTurn on the 2nd for five min and then turn it off. 3 q1 {* H0 H# W& g' O- rTurn on the 3rd and leave it on.) \; w; {0 @# J2 ]5 y5 T
And then go upstairs right away.0 X& b/ t" K q. b6 ]% r: p! o
4 K6 Q% p' e/ r0 R5 b' |
Find the answer by using your fingers and eyes# v7 _& s" s: c: j: N
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 " D9 m$ Y( e! c6 g X5 `Turn on the first for one min and then turn it off. 0 }7 a& t1 t) NTurn on the 2nd for five min and then turn it off.5 O& g" T, z f
Turn on the 3rd and leave it on.' J6 q7 B# G* _5 k
And then go upstairs right away.- }+ o3 x" w g0 ?
8 B0 K8 U: v2 M* A R/ F9 dFind the answer by using ...