Turn on the first for one min and then turn it off.4 f4 Z' f' P7 G* b* I! c
Turn on the 2nd for five min and then turn it off.! C' u& K; s; f( K- H
Turn on the 3rd and leave it on., z' i! y4 j8 N3 M* v" z* v4 ?
And then go upstairs right away.) L( e4 j; z" ]! c$ ?8 n& _
7 ]+ G r7 j3 p8 n, P0 CFind the answer by using your fingers and eyes a) Z2 }$ [8 M7 H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& Z6 D! ^5 u4 `# NTurn on the first for one min and then turn it off.$ C0 l5 U+ k8 \- q; J
Turn on the 2nd for five min and then turn it off.) O7 T* t1 b% N6 Y* H/ Q$ j3 z
Turn on the 3rd and leave it on. 1 e2 H/ d6 S: J& _7 n5 _- Z) \And then go upstairs right away.2 v7 {% E2 { J
8 z+ e. |% @1 B; I4 H! DFind the answer by using ...