Turn on the first for one min and then turn it off. ; [% A8 S. o( k* c1 | DTurn on the 2nd for five min and then turn it off. ' y$ R7 z& @- [4 yTurn on the 3rd and leave it on.2 R6 n; Y' \* s' e
And then go upstairs right away.. n, D. K0 w# X5 p
7 Y2 I# W* j. i
Find the answer by using your fingers and eyes; _( }/ \. r2 s2 t1 p% H* v" V
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 $ ~) m# {8 q7 u* o+ rTurn on the first for one min and then turn it off.1 K; V: F4 X" M% g3 R) e; Z
Turn on the 2nd for five min and then turn it off. N- T5 B2 ` J! n. P1 w
Turn on the 3rd and leave it on. . O7 Q# x8 N, d: X' Z TAnd then go upstairs right away.( g5 b- Y! P, p6 ~. g
, `1 i g. I& N3 Y# i$ b# uFind the answer by using ...