Turn on the first for one min and then turn it off.4 N7 ]7 h+ _* k" U% {* O( S; V- P
Turn on the 2nd for five min and then turn it off. ( Q4 |. n2 G0 oTurn on the 3rd and leave it on.5 t4 n2 `% g/ a* M
And then go upstairs right away.8 T: _% ?6 J' E0 F1 O" T3 b
+ f, ?! B' n3 t/ G: }& RFind the answer by using your fingers and eyes: ]# ~2 J: x3 D
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 ; y9 h6 I- C9 Y7 u' |+ |
Turn on the first for one min and then turn it off. 4 N; Y' c8 E% VTurn on the 2nd for five min and then turn it off. 8 D* G, d1 |; P) _, k& eTurn on the 3rd and leave it on.# a5 {2 G* d4 v
And then go upstairs right away.; |) z# w6 n! d `$ z7 P
) [# q3 b2 p. o) |0 z) \# W
Find the answer by using ...