Turn on the first for one min and then turn it off.+ H& _2 A- @: d& T) Y4 v6 I+ G
Turn on the 2nd for five min and then turn it off.* y; @& ~* {% A, s3 F8 v
Turn on the 3rd and leave it on.$ x+ k" p4 \/ D
And then go upstairs right away. ! l! k) X; {. | ]( U9 |( L7 P* d1 Z) f
Find the answer by using your fingers and eyes+ y. V; ^; z: r' j% o7 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 5 {8 D+ c3 F5 ]" e; ^9 i4 NTurn on the first for one min and then turn it off.: B/ q- \! k B8 ?5 G O9 Q( y
Turn on the 2nd for five min and then turn it off.- A7 M9 I r8 E
Turn on the 3rd and leave it on.- g$ l3 r7 M; i
And then go upstairs right away. , } j2 B6 E( R! e! i; ?5 b+ [! Y2 n7 [! A7 X# Q
Find the answer by using ...