Turn on the first for one min and then turn it off.) ~$ b' y3 r( l& U
Turn on the 2nd for five min and then turn it off. . b- Z! t( W7 p! Y* d! k/ QTurn on the 3rd and leave it on.3 ]; u/ e1 k% \7 r9 [; e
And then go upstairs right away. 7 ]7 m& y& ]1 U* L; V( R3 |7 b( I2 z % r8 @& }3 X: U- S6 hFind the answer by using your fingers and eyes( a- z- |& S3 d4 J& N% j# H0 |% r
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 0 b( F; F% O9 [3 |( R+ a# C# x8 @Turn on the first for one min and then turn it off. ( q6 u: G! Z" `* @$ `8 q" _* X4 YTurn on the 2nd for five min and then turn it off. # z& y: l. l2 |/ \( P8 L; `0 ATurn on the 3rd and leave it on.1 p" W9 m/ P6 D4 `% H
And then go upstairs right away. 5 J) S2 \ G$ ~/ J2 J6 L( ?# }5 s; [3 C
Find the answer by using ...