Turn on the first for one min and then turn it off. 7 M' q( c3 c+ t1 OTurn on the 2nd for five min and then turn it off. 2 @5 p2 {. }8 l6 d2 P' uTurn on the 3rd and leave it on.7 c y0 ^2 X* D' H4 q
And then go upstairs right away. K* O* h3 S# t0 N" K
: d h5 e. p: ]6 C. {( SFind the answer by using your fingers and eyes+ x! g- P$ ^" I/ 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 ) ~: Q' b) A8 ~" ~0 V
Turn on the first for one min and then turn it off. 8 z# x P6 n5 u) J; LTurn on the 2nd for five min and then turn it off.' }- ~7 q9 }6 v# [) D+ p* n- I
Turn on the 3rd and leave it on.+ H+ E& l- z( t: F, }
And then go upstairs right away., ]0 }& L8 k2 Q- U) u' p+ ]# A4 ^
! K. O8 |+ t; H% n
Find the answer by using ...