Turn on the first for one min and then turn it off. / t7 A' V; l# bTurn on the 2nd for five min and then turn it off. h& A# P7 ?) M; w; L' q
Turn on the 3rd and leave it on.# Z: y* T8 _/ B' Y* H
And then go upstairs right away.% M0 B! i! [& Q8 N5 n4 ^! R8 D
! h" q. {+ d9 S8 J& @Find the answer by using your fingers and eyes* f( l9 [9 { N- H+ e7 P; }5 {
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 ; c9 H( j- q) z' R! F9 O
Turn on the first for one min and then turn it off. : l" Z8 X& G1 x; w' S1 k& OTurn on the 2nd for five min and then turn it off. e5 e3 M7 ~& P% @5 {7 I2 FTurn on the 3rd and leave it on.+ j( d6 G% {& B3 j. |- W/ C
And then go upstairs right away.6 X3 U! [1 J# Y! ]
1 W1 |! x, Q1 a4 k) y1 ~) F
Find the answer by using ...