Turn on the first for one min and then turn it off. 9 R) F, a; D( mTurn on the 2nd for five min and then turn it off. 3 ~1 l/ I& c% P# S7 yTurn on the 3rd and leave it on.- ?' e) T2 h3 A+ e
And then go upstairs right away. : n$ `6 b6 b @! q" D6 P( u5 C1 D! x( c' O1 @' u9 L+ X' l
Find the answer by using your fingers and eyes8 M7 x, h8 f* p6 p/ }3 D* V2 o
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 . B' N( e3 c6 ITurn on the first for one min and then turn it off. , B. R! R* ]6 E Y3 _4 s; LTurn on the 2nd for five min and then turn it off. 1 V4 U0 C& o0 G5 b& z" b% oTurn on the 3rd and leave it on.' o5 E3 Q; y( x4 ~ B' T( [, k& m
And then go upstairs right away. - R b- f8 s1 ~' d6 i) y% ~2 @; |- \" J% p# [( \; g
Find the answer by using ...