Turn on the first for one min and then turn it off.+ q# W1 l) X% d7 w: [
Turn on the 2nd for five min and then turn it off. 7 s$ H2 W4 p3 r! TTurn on the 3rd and leave it on.- g. O" \8 d# A! Q0 j F
And then go upstairs right away. * d. z2 Z; V7 }/ w* x" F; p1 M6 K& T. h6 g' X. P; |! V
Find the answer by using your fingers and eyes2 ^ H$ l( s. @$ [9 m( ~/ x. m: e
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 l' H @2 [$ \$ C5 B) MTurn on the first for one min and then turn it off.1 R* U5 }5 w' _# ~
Turn on the 2nd for five min and then turn it off. + C m* r! L8 x& p mTurn on the 3rd and leave it on. ; i6 k3 V6 O" }And then go upstairs right away.; B- ]. t3 Z+ f. y
3 D/ w$ {* b8 ]9 O/ Y7 r9 R
Find the answer by using ...