Turn on the first for one min and then turn it off. 5 i/ a [* q H& r) |& ~Turn on the 2nd for five min and then turn it off.( |: ]% h) h7 N4 T* `+ ]
Turn on the 3rd and leave it on. 3 t( g) }. H8 z! y. MAnd then go upstairs right away.5 l( o: x, ]8 p2 F |* h
9 B" U r. x1 m+ M7 I0 a* kFind the answer by using your fingers and eyes7 U' b- K7 i5 [' {+ Z, L
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 ; Z8 l2 G6 \- r m! d7 k6 r/ e
Turn on the first for one min and then turn it off.* D) m2 J, g: X- F
Turn on the 2nd for five min and then turn it off. 8 E" G6 N8 t' \0 DTurn on the 3rd and leave it on. - x7 {4 b9 \+ nAnd then go upstairs right away. % I, h( a7 Y$ _- [3 |0 I, B d : |& B, v0 w: o6 P- e9 W% NFind the answer by using ...