Turn on the first for one min and then turn it off.: k- Y* v' t- i; ~
Turn on the 2nd for five min and then turn it off.) J( T8 a M2 u( t* r1 Y) o: P
Turn on the 3rd and leave it on./ S8 k: c; p" S- j
And then go upstairs right away.! _/ R3 Y, ]# d+ \
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Find the answer by using your fingers and eyes4 O8 v, M! j6 H" D* 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 . X& o4 k" e x% d& C; i; I. i3 }Turn on the first for one min and then turn it off. . A% d: C# o7 b" @; kTurn on the 2nd for five min and then turn it off. / v; n2 h& n {2 w. p- G1 hTurn on the 3rd and leave it on.7 T* U% W6 [8 j! b3 N: A
And then go upstairs right away. ! I0 s; k/ m% a7 a4 C; S% U0 ?" Y, e1 P7 ]1 c" ^
Find the answer by using ...