Turn on the first for one min and then turn it off. 6 _" F9 b: Z' p, cTurn on the 2nd for five min and then turn it off. & ]( |# V1 h- }: O7 c0 C o5 CTurn on the 3rd and leave it on.& H5 U8 Z0 H2 ^, e. h- S
And then go upstairs right away. . ~% U$ g' ~- m1 @( B ) I: d. \% r2 H3 T6 m3 S. d6 B( PFind the answer by using your fingers and eyes- m# l( Z# B7 }( Q' 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 4 D1 ?4 D. l' [5 ?6 R+ `* B. CTurn on the first for one min and then turn it off.; n2 M/ x( w! z; a' e4 G: ^
Turn on the 2nd for five min and then turn it off. 5 D% h* D K2 Z# MTurn on the 3rd and leave it on.! Z2 Z2 p# X+ c$ t. R
And then go upstairs right away. 1 `/ O1 j# p5 |/ j 9 Y' z1 `. k; P# ^1 w) lFind the answer by using ...