Turn on the first for one min and then turn it off.$ g( R" I$ n& C' a) P, q
Turn on the 2nd for five min and then turn it off. ; w) ~& L" {- s2 FTurn on the 3rd and leave it on.; S# h" D; v U( C3 ~
And then go upstairs right away.& ^5 S: N, e* C) j6 }8 R! x2 `
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Find the answer by using your fingers and eyes1 I8 ^8 y5 i" n, q* A
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 8 s4 k8 U5 V1 i' Q) _3 v) o5 I9 D; y; X
Turn on the first for one min and then turn it off. 2 N2 C' R5 S7 }% j' ^% vTurn on the 2nd for five min and then turn it off. 1 \- r+ g. O- X; O8 YTurn on the 3rd and leave it on. ; [0 H a" z+ j+ E2 q0 yAnd then go upstairs right away.5 O$ u8 P1 A! \$ M- I& c
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