Turn on the first for one min and then turn it off.5 G' u! p3 A2 S8 J3 p. g
Turn on the 2nd for five min and then turn it off.3 `; Y" b" ^# _) s3 Y5 y
Turn on the 3rd and leave it on. % B4 n$ L# z5 {7 C7 sAnd then go upstairs right away. ! j( N; ^2 h4 l* u( t3 {# t5 J ! e; ]7 v3 r A# U+ Z/ q! x, l8 @Find the answer by using your fingers and eyes- J# k, b5 `3 w# U; o: i
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 ' Q3 G6 ?, T1 A1 }, f# rTurn on the first for one min and then turn it off.3 p# Z6 c7 `: Y
Turn on the 2nd for five min and then turn it off.# R: A6 o- U; f2 x: _) P: {7 g) v
Turn on the 3rd and leave it on.' H' Z1 n8 m$ k5 u+ C8 [0 J4 x
And then go upstairs right away. 2 u& S3 W& [3 o0 a, x9 Y$ l0 l6 j3 J/ u% A
Find the answer by using ...