Turn on the first for one min and then turn it off. ( _+ n2 _7 C" Q7 ITurn on the 2nd for five min and then turn it off., t7 R) [- r: s8 F7 p
Turn on the 3rd and leave it on., [; S2 N" ~9 F5 k. a
And then go upstairs right away. . G' _ u# B% _1 k7 p) ^2 J, r5 }0 ~% A, X2 I
Find the answer by using your fingers and eyes 2 n. P' u) Z8 a$ I$ r3 {/ u8 e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 r- b$ Q- {- m% ^Turn on the first for one min and then turn it off. # |7 i8 L; G7 H! CTurn on the 2nd for five min and then turn it off. % o5 L0 Z" M W2 CTurn on the 3rd and leave it on.5 ^) r4 w4 j$ b' q% t2 k
And then go upstairs right away.( K( u( I6 @6 n9 C! T. L" |* s
8 i3 X* g+ }7 |7 \! n, |% pFind the answer by using ...