Turn on the first for one min and then turn it off.8 s% o4 A+ [* L$ n' K& ^# w1 b
Turn on the 2nd for five min and then turn it off. n9 j* Y/ R* L6 ^" A- RTurn on the 3rd and leave it on.: Q- m* J; ?0 W0 `6 k( k7 Y( G
And then go upstairs right away.! D4 h- q, Y! o9 N7 c9 ^6 J
& W( ^0 @9 D3 y! ]3 x* V1 B
Find the answer by using your fingers and eyes 7 {* r) q% ~% O, `) P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 7 J$ l7 @+ q: I# S' I ?( w# I' |Turn on the first for one min and then turn it off.$ D; G, G+ e) h7 T$ x" R
Turn on the 2nd for five min and then turn it off.- R8 T) J. u4 c; {0 W0 F4 p
Turn on the 3rd and leave it on.( X$ Q$ X+ g) W
And then go upstairs right away.* ?1 J" s4 @: o5 T Y
' m2 [% w' z) e% J4 J( V) N4 {Find the answer by using ...