Turn on the first for one min and then turn it off.& c, [3 v5 N! _: v" U
Turn on the 2nd for five min and then turn it off., c3 T2 k: U( R `3 d! a( D+ ^& Y
Turn on the 3rd and leave it on. 5 D$ E v& A. f1 D* M8 g( Y( W2 \And then go upstairs right away., {( x/ X6 t" b: P8 s' [3 R h
' F0 v& v) `: S* wFind the answer by using your fingers and eyes $ }5 ~3 R. t1 L! t! Z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 6 [( ?5 a8 Z( n/ o& o& g/ {
Turn on the first for one min and then turn it off. $ z. }4 u6 K" O' wTurn on the 2nd for five min and then turn it off. n. g' j# E- q# A. c! O4 K$ B% B/ LTurn on the 3rd and leave it on./ u4 c: o& g3 R% Y* b* I. q
And then go upstairs right away.% A6 S/ @" G! s. O1 w
7 ]( v) V& [3 G. N5 A
Find the answer by using ...