Turn on the first for one min and then turn it off.5 r& h2 ]/ E) V l% Q. _
Turn on the 2nd for five min and then turn it off.8 j) Z- \/ q2 O" b' W4 y5 R
Turn on the 3rd and leave it on.; M+ v" g" ~- p9 c% W8 M
And then go upstairs right away. 9 Q/ O* t3 n( |, l7 z2 \' A a% t6 W
Find the answer by using your fingers and eyes ! V3 [. l: D- M) `& o( w5 {% M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 0 l7 N2 h X$ b( s
Turn on the first for one min and then turn it off. & L9 S7 D8 u. k) aTurn on the 2nd for five min and then turn it off. " t8 ]$ k! z$ Q: Y! nTurn on the 3rd and leave it on.% ]5 ^! l- ^9 o* @6 E1 ]: x
And then go upstairs right away. / \" W" M: \' q- R2 |6 j" R! b: ~+ e0 R; s/ ~( h! S; h
Find the answer by using ...