Turn on the first for one min and then turn it off. + m4 Q& d$ N' c( dTurn on the 2nd for five min and then turn it off. # m+ o( ^0 N: T& V8 e6 t2 xTurn on the 3rd and leave it on. 7 C0 s9 }0 n. S: F$ v* dAnd then go upstairs right away. 0 z5 N% G, C/ M2 X6 W$ n7 d2 j" q" R
Find the answer by using your fingers and eyes4 G+ l9 K; }$ v- H' S5 B9 r
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 ! e" W w0 E, V( _3 tTurn on the first for one min and then turn it off., ]' O3 e( m+ m4 j7 y: p& D3 K' r
Turn on the 2nd for five min and then turn it off. e: e/ Y. ^' q: ~* R! Y' ~Turn on the 3rd and leave it on. ' ?" p5 f6 v" Y I. LAnd then go upstairs right away., w4 ~/ A* q) V; a9 w) \
! a2 Q3 P, t' l1 e; F) m. XFind the answer by using ...