Turn on the first for one min and then turn it off. q4 l. W8 W( n; v- j/ V+ E
Turn on the 2nd for five min and then turn it off. / u7 {& g$ D4 S6 {6 hTurn on the 3rd and leave it on. & P1 t/ Q+ g9 o) b: e8 ^2 F2 aAnd then go upstairs right away. 9 \ P ^+ v7 h4 v7 c6 t+ c" r7 S, b
Find the answer by using your fingers and eyes. b( b, @- p5 {- t$ P E" S8 Y' A h
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 ( h% |& b8 `% U: m6 I
Turn on the first for one min and then turn it off., d$ \+ R; G/ w- n0 Q9 x. K
Turn on the 2nd for five min and then turn it off. ' W" {7 V" g3 F) V! jTurn on the 3rd and leave it on.$ O' y' f" S0 S& o: z4 G6 E; [
And then go upstairs right away. 9 x J ~% l8 k0 w8 U, c3 B7 x( k# y' d, W# C
Find the answer by using ...