Turn on the first for one min and then turn it off.. u, b& O' N* ^& l+ K
Turn on the 2nd for five min and then turn it off." W9 W+ E" \; n! T3 P$ f
Turn on the 3rd and leave it on.# k, \) \' V {* l
And then go upstairs right away.8 E! b* U4 x6 ]8 x4 y% p
6 ^) ~6 S8 c7 j% p( ~Find the answer by using your fingers and eyes 9 \4 T% r/ y' l. Q8 q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 |3 B* Q, V0 O! ? M
Turn on the first for one min and then turn it off.$ e8 B* E& ~' v, ^+ h
Turn on the 2nd for five min and then turn it off.8 R |2 o- y+ M. [, c
Turn on the 3rd and leave it on. + t) I1 s9 w4 q$ fAnd then go upstairs right away.& M$ w b. a7 E; O! _
7 ?* i; O8 ~3 ~9 t# U# FFind the answer by using ...