Turn on the first for one min and then turn it off. % i$ b% d# Q2 c( rTurn on the 2nd for five min and then turn it off.6 A; \) \9 u$ L1 R3 Q* M
Turn on the 3rd and leave it on. ! }; N% A8 e! x0 {/ Y" }9 ?And then go upstairs right away. $ e- W8 o1 X. d0 p0 D5 y* m2 e% {
Find the answer by using your fingers and eyes: s, p5 ]9 o& x/ g4 [
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 3 b: e$ |# }8 t+ V" aTurn on the first for one min and then turn it off.' n# P/ B% D5 `7 [: k( [- B
Turn on the 2nd for five min and then turn it off. ' C0 `# Q5 [3 yTurn on the 3rd and leave it on.5 q- ^2 M) M5 N6 s) g8 U
And then go upstairs right away.8 P1 W F9 O5 o }: [5 v
6 D/ D# Z. C1 J7 a" V* k4 s
Find the answer by using ...