Turn on the first for one min and then turn it off.4 q# P/ w- |8 |5 _* c$ Z2 i
Turn on the 2nd for five min and then turn it off. 7 I: g) r9 b4 dTurn on the 3rd and leave it on. 1 N+ Y4 ]0 T* K1 _! dAnd then go upstairs right away. $ n! r; v2 S% w4 h' h8 [# i! \3 w% p
Find the answer by using your fingers and eyes & S& o3 C9 W+ e1 ~/ x: C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 1 Z: l5 H# w4 @7 F
Turn on the first for one min and then turn it off.% w1 H' e* r; S( E" ?* Y' w/ t
Turn on the 2nd for five min and then turn it off. 2 q: ~1 b$ \) g; yTurn on the 3rd and leave it on. " L- k5 H5 ]/ K# o' i& yAnd then go upstairs right away. 0 }/ [9 s4 @& R0 o * c* |, U- ?' h7 v7 VFind the answer by using ...