Turn on the first for one min and then turn it off.5 k% }, h9 Q0 ]
Turn on the 2nd for five min and then turn it off. % \9 F4 U, F1 B3 ~6 }+ }Turn on the 3rd and leave it on. 1 f( B+ z8 {0 H: z* uAnd then go upstairs right away. # J' u& m* m# D9 C/ \4 X5 g8 e$ v# B) E" }. s- q. R
Find the answer by using your fingers and eyes c" p# I) u, }9 U1 l. I$ h' x& G
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 3 Z$ j( `: }# a9 _: G0 b5 Q
Turn on the first for one min and then turn it off.: R/ b+ f( {& K6 ^1 a) _8 j" o
Turn on the 2nd for five min and then turn it off. 4 y* X& G- A6 h) s% K! n/ u; CTurn on the 3rd and leave it on.( C0 z, q; {# p* f7 f
And then go upstairs right away." E5 C) Q q( n5 M" B. U2 @; b
8 l% q/ W! F [) O7 `0 N: h* hFind the answer by using ...