Turn on the first for one min and then turn it off., S* Z+ s. v n# I. a2 ~
Turn on the 2nd for five min and then turn it off.& i8 o; u1 ?" Q- M0 H% \9 x" R
Turn on the 3rd and leave it on.! I, o3 q+ N0 K+ Q: f) G
And then go upstairs right away. + u' c6 z; F! ~6 Z4 Z. |- t/ a 2 s+ O% H6 E9 B; F( ZFind the answer by using your fingers and eyes " T, N( B0 k; Y! A4 a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 6 P% _4 I D; ^1 O
Turn on the first for one min and then turn it off.( Q/ J) c- [1 I* m/ b. B3 i
Turn on the 2nd for five min and then turn it off. + A2 q+ w+ W6 n6 [Turn on the 3rd and leave it on.# Q+ T/ w5 N+ k6 {% L9 R" |" m
And then go upstairs right away. - S& N7 C5 C( [5 t. ]5 F. z5 Z5 u( S% a3 d: W
Find the answer by using ...