Turn on the first for one min and then turn it off.: z: z0 I* x' T+ @& S" ]
Turn on the 2nd for five min and then turn it off. ( d# M) Z; k9 ?: z# @Turn on the 3rd and leave it on.2 i# Y" ~4 ?/ B2 ~1 n# H
And then go upstairs right away.* J' q+ F' ?. e7 q# Q: L/ o
! C8 H A# K: s DFind the answer by using your fingers and eyes & N+ A, G+ N$ G3 V7 G8 a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 # @: h1 Y- ?# z) n
Turn on the first for one min and then turn it off.2 s7 H& [8 s6 z/ c$ U
Turn on the 2nd for five min and then turn it off.9 X& C/ W6 z! c) w; |# D! L$ c. i
Turn on the 3rd and leave it on. 2 e1 ?, y% A; N* M& fAnd then go upstairs right away.+ q4 I: k" U2 w. |
. _4 @0 x4 a, i+ }) z' `3 ]- hFind the answer by using ...