Turn on the first for one min and then turn it off.$ @( K' F* y a& D+ z
Turn on the 2nd for five min and then turn it off.# X% ]' ` R- q" p) N& _1 o- D, [3 d
Turn on the 3rd and leave it on.& P; _4 S1 w- [6 o- x2 `! b2 R
And then go upstairs right away. - P5 L' f5 j' a2 X: }4 H! @& E* }* u; P/ e( a8 F7 y
Find the answer by using your fingers and eyes ]5 I+ p7 y; U4 e
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 8 ]# Y7 V: b' E1 e6 a. R' qTurn on the first for one min and then turn it off. ! J( h4 K! N$ i7 t6 sTurn on the 2nd for five min and then turn it off.4 b" n& O) l! V7 n5 ^& l: s8 X
Turn on the 3rd and leave it on.9 I6 y* P& p% R2 r
And then go upstairs right away.6 l3 ~% v: S# V2 ]6 s! z. ?
4 m+ y2 [0 ]5 [
Find the answer by using ...