Turn on the first for one min and then turn it off.' ^; X" p$ M3 X5 u u7 m( ?
Turn on the 2nd for five min and then turn it off.+ b( _" m1 A5 a& c- R- Z0 u+ V
Turn on the 3rd and leave it on. 2 s1 O& x* F/ V; ]And then go upstairs right away.$ j( Y8 f$ ?! q
5 X( I: U' m' ?4 Q- r) |0 I7 \Find the answer by using your fingers and eyes - V. `. a5 y P! E; b/ {4 R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 $ u g1 J w' V% f* L+ D& d
Turn on the first for one min and then turn it off. , d: X* E0 i- @2 [, w1 W: y8 lTurn on the 2nd for five min and then turn it off. & a& D5 c9 f' K2 i$ a$ vTurn on the 3rd and leave it on., L' k- j( F4 Y3 L8 O" J1 Q
And then go upstairs right away. 9 Z3 ^" t8 v. [% w 8 U" f/ A% a$ a$ NFind the answer by using ...