Turn on the first for one min and then turn it off.' q6 \* F4 S- G7 O y
Turn on the 2nd for five min and then turn it off.( g2 p4 l# p# o! V; a7 s# i
Turn on the 3rd and leave it on./ j4 E! w+ S0 R; ~- T
And then go upstairs right away. 6 M2 y: R! y2 {: J9 U$ } ! b H5 j& @( Z2 DFind the answer by using your fingers and eyes / c: R, w4 w! i# \: L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 - L6 d; Z+ ^5 g! A
Turn on the first for one min and then turn it off.$ T7 q' K( o! |& }5 W
Turn on the 2nd for five min and then turn it off.; F" F, V: e B& h/ [2 T& X# T
Turn on the 3rd and leave it on. 5 F1 T0 W' m! Q' y5 s! KAnd then go upstairs right away. 7 A9 G4 H! L: S, `. A8 } : k' G, S J: s/ z# rFind the answer by using ...