Turn on the first for one min and then turn it off.3 i0 [9 c% |4 |# X
Turn on the 2nd for five min and then turn it off.# H& q6 E/ S# \7 p2 H2 Q$ y' `
Turn on the 3rd and leave it on. 7 k$ b. S+ a% ?- N- W g; u8 SAnd then go upstairs right away.8 ]0 {" ^8 l! {
; g" {8 a8 S# C+ F* z0 l. Q5 UFind the answer by using your fingers and eyes ; i4 k3 X8 R" 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 . X$ K7 l& n+ uTurn on the first for one min and then turn it off. # @& B& F9 r2 V8 |3 |. i0 H9 J7 G- }Turn on the 2nd for five min and then turn it off.' X6 U0 l( x" R) V1 g2 \& A, X
Turn on the 3rd and leave it on.! w/ R4 W/ N2 F
And then go upstairs right away.9 b8 q" g0 U5 b% {( ^; _
; P% t) a W' h2 ]6 i- K
Find the answer by using ...