Turn on the first for one min and then turn it off., W. M) F" I; L' K, g4 |6 u9 p. J
Turn on the 2nd for five min and then turn it off. / \( y* H# V5 R2 CTurn on the 3rd and leave it on. 2 T5 A' }2 q, V) b GAnd then go upstairs right away. * C$ R3 o& J: ]7 Q) q7 X7 t8 A2 a6 t3 Z" i+ c7 Z+ ~. g
Find the answer by using your fingers and eyes! ^ J- E& C9 Q* h4 a- f5 Y- G0 j
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 ) Z! E) s( R! ]7 K& F- y
Turn on the first for one min and then turn it off.. q J+ t$ z. I2 x7 m0 c2 m/ t+ t
Turn on the 2nd for five min and then turn it off.- U; n7 @) M( e2 e) {. H# Y
Turn on the 3rd and leave it on. ! i; P. |) D" q( {And then go upstairs right away.6 x1 D/ u3 w7 d& _ L2 f