Turn on the first for one min and then turn it off.9 q2 K+ x, K- Y: a
Turn on the 2nd for five min and then turn it off. 6 {4 T! z8 k1 s" O9 b( C) a. NTurn on the 3rd and leave it on.% `! B$ f& [" C
And then go upstairs right away.8 A" M/ _$ }. L, c& T
' ^5 M6 ?& `1 X! {$ p; J0 y8 _" r* B
Find the answer by using your fingers and eyes ( @6 K% {/ O2 d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 & n/ B8 H" a' B6 _ \ I
Turn on the first for one min and then turn it off. 7 v- {' O9 M0 nTurn on the 2nd for five min and then turn it off. 5 C* w# Z {( k: S' { CTurn on the 3rd and leave it on. # ^) S5 ~, u1 M K7 _" T- xAnd then go upstairs right away. * q( j; b+ }- q' ]7 {1 X8 G. d2 @, s: P5 t
Find the answer by using ...