Turn on the first for one min and then turn it off.' G6 I2 u& i* t
Turn on the 2nd for five min and then turn it off. 1 [9 o- M# M% s) u! g6 g! {Turn on the 3rd and leave it on. 1 j9 A1 M9 K; Z: vAnd then go upstairs right away.2 c* Q6 P2 J% N7 E: d
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Find the answer by using your fingers and eyes* d8 [! ]; M s( M) {
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 - b! X, e7 F: `8 m9 B( K cTurn on the first for one min and then turn it off. ; |" q0 q& `- J. ~" d! JTurn on the 2nd for five min and then turn it off./ e+ a3 R \# x$ Q; U0 P6 ?2 K
Turn on the 3rd and leave it on.7 Q$ U' S! m+ Y( P. f# M: f4 r( X
And then go upstairs right away. # t' b6 w1 p$ J! X7 ]6 g( n( j 3 \4 b. m) O1 @$ I5 }* H# L6 ZFind the answer by using ...