Turn on the first for one min and then turn it off.$ G; M1 I) ?7 {+ u0 A
Turn on the 2nd for five min and then turn it off. + L. e2 o6 ^9 F" B5 OTurn on the 3rd and leave it on. % z% f( j$ M) D, mAnd then go upstairs right away. ( l7 S1 i, M+ C7 F1 i, f! {) Q) e) I% S, z- i
Find the answer by using your fingers and eyes' W$ A' X2 C9 y- `3 X2 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 y, m# ~+ v/ o7 j0 N- E5 T
Turn on the first for one min and then turn it off.$ T3 y$ R9 S& p9 Z& ~
Turn on the 2nd for five min and then turn it off. 6 @/ b5 m! T- x1 P. a( TTurn on the 3rd and leave it on.0 ?+ y9 P; o0 i; ~6 O
And then go upstairs right away.- W) a3 S& g7 S" m4 Z