Turn on the first for one min and then turn it off. z, ?0 z4 ^; p4 B5 v; j
Turn on the 2nd for five min and then turn it off. b# l, P( i* t* J
Turn on the 3rd and leave it on. % z4 V' {# g2 HAnd then go upstairs right away. 3 b5 @3 q* W. {9 q/ {& g& h8 l, }/ F6 R5 b
Find the answer by using your fingers and eyes ' C; G- t- d5 ^2 _/ g& _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 . x% l: A8 M; c! k# |- m P
Turn on the first for one min and then turn it off. - _. W+ F5 V3 H/ }8 E3 }" e; u9 HTurn on the 2nd for five min and then turn it off.3 m, B4 u3 W* ~! w0 d
Turn on the 3rd and leave it on.% ]7 Z2 ]5 D9 ^" Q. i% z( p
And then go upstairs right away.& P) W, ^% I7 d$ E! \