Turn on the first for one min and then turn it off.% a: ]: c( o% h7 z
Turn on the 2nd for five min and then turn it off.) ]# j0 C7 N2 k7 [+ _# {
Turn on the 3rd and leave it on.! W6 r. V$ ~3 D& j' E# J" @" [3 H3 I
And then go upstairs right away. 5 q/ t4 B2 w0 W! I# E+ F8 T" m : i$ \/ T' c9 J; i; yFind the answer by using your fingers and eyes4 M. U! Q. c4 T3 ?
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 9 z! X. ^: w" s2 W' b! N: ?
Turn on the first for one min and then turn it off.* ]: n' @- d5 p# _5 b/ m
Turn on the 2nd for five min and then turn it off.; k7 T1 w8 K2 P/ u
Turn on the 3rd and leave it on.2 ^* W5 b+ d/ }- U% x: Y
And then go upstairs right away.- R* Z7 y' t* s) t9 c n
e" u3 s7 n' i/ s7 T `' l
Find the answer by using ...