Turn on the first for one min and then turn it off. 3 i- r; k8 s: STurn on the 2nd for five min and then turn it off. & q% m- ~" }( lTurn on the 3rd and leave it on.$ g W& W" V7 f: V4 {, ~2 f
And then go upstairs right away.9 X7 j& w3 h5 ]6 G' T8 x; R& C
+ g; p% K0 w9 K3 r, m! CFind the answer by using your fingers and eyes3 P1 W" ~ P: d2 f. ^
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 " @( W& ]4 P) Y, k- x
Turn on the first for one min and then turn it off. v! Q/ e9 t& a9 A' _" b+ s% w& a
Turn on the 2nd for five min and then turn it off. % Z D2 D3 v( A( b- s/ e7 |& OTurn on the 3rd and leave it on. $ p5 w) n9 Z0 W& S+ P' ^2 bAnd then go upstairs right away. ; Q. d4 l2 n3 u4 n2 E* M- a9 x ) v) u1 q) Z* s" E# T5 O' lFind the answer by using ...