Turn on the first for one min and then turn it off.. M$ q) \3 u- x% i- N
Turn on the 2nd for five min and then turn it off. $ I( Z/ Z9 Y1 n1 R. cTurn on the 3rd and leave it on. 1 T' ?, R s) h2 {1 T. Y2 E- rAnd then go upstairs right away./ c/ }. \3 E/ ~' y# Y
- J* d6 e/ X$ y+ B3 jFind the answer by using your fingers and eyes + M4 _( f( y7 M- ^0 j8 u) N/ N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 2 D2 r7 w* R3 B, j
Turn on the first for one min and then turn it off. # d1 e2 W/ \ qTurn on the 2nd for five min and then turn it off.3 i f2 H2 ~; d: E9 D+ b4 T
Turn on the 3rd and leave it on. e1 n, [$ Z) Q0 N7 p6 W
And then go upstairs right away. ( z2 ?9 y4 L B# ^6 o# b, w1 ~, Y$ z. g
Find the answer by using ...