Turn on the first for one min and then turn it off. ( [( U) V; J7 g, LTurn on the 2nd for five min and then turn it off. 7 a# ?5 r W& U4 ~3 O2 mTurn on the 3rd and leave it on. ( ]5 U b! j& K4 a5 RAnd then go upstairs right away. . V" z0 ]( e$ k! w: N( ?: F* R7 j) ?1 }, \$ s
Find the answer by using your fingers and eyes 0 E( s3 H+ s/ \, M4 Y3 ?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 ( L3 [; n) E4 y, FTurn on the first for one min and then turn it off. 3 S( K& M& j. B& RTurn on the 2nd for five min and then turn it off. . h& u7 `: b5 [- H, w" GTurn on the 3rd and leave it on.: F) j' g; l; J
And then go upstairs right away. 8 `' r2 ]7 ]! Y3 O, d' k" w q3 P5 G
Find the answer by using ...