Turn on the first for one min and then turn it off. j8 y) T- G; E9 V5 G+ V& Q1 f9 TTurn on the 2nd for five min and then turn it off. / p, G, w! ?2 Q3 N3 xTurn on the 3rd and leave it on.7 i: x; {8 h3 `) N. X# b+ A
And then go upstairs right away. 0 \5 f/ }1 A: i8 _. P* J1 Z) Q3 R& V; K7 t
Find the answer by using your fingers and eyes0 m! _& ~" ~/ ^6 B# v
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 . H; b/ A# a& YTurn on the first for one min and then turn it off. 3 q5 f: t5 {( a& f8 RTurn on the 2nd for five min and then turn it off. , N U4 A. M3 E5 N( \$ [4 G5 YTurn on the 3rd and leave it on. 0 Y5 H$ u. k6 B6 t8 O* GAnd then go upstairs right away. . e1 P6 [+ K6 V / q7 `$ b' p0 q" I3 ~9 kFind the answer by using ...