Turn on the first for one min and then turn it off.* M0 R; i8 g- N& d) ~5 }0 ~
Turn on the 2nd for five min and then turn it off.$ |) [6 N+ ^. d2 M; U) H0 I4 h
Turn on the 3rd and leave it on. 9 o# i% n6 d. S$ G0 a* N- d }; aAnd then go upstairs right away. - g6 H0 r/ M& U0 L* y `5 ~- ~! @3 d# k9 WFind the answer by using your fingers and eyes ) g) W9 \, u( ]5 s/ L2 @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 5 e2 _7 b" D9 Q- w# F
Turn on the first for one min and then turn it off. 6 {& F3 z' u7 B+ t" W' i. y6 \Turn on the 2nd for five min and then turn it off. 2 e. i. ?. a8 F7 b2 j/ TTurn on the 3rd and leave it on.: Q# `7 F |4 n" U
And then go upstairs right away.& [6 d- M( s* I* y
. b; i+ G6 f0 W$ J& g: B: O
Find the answer by using ...