Turn on the first for one min and then turn it off.% k# Q% q# B) C4 X* J! R, `* U" T0 X
Turn on the 2nd for five min and then turn it off.% v7 { o' W6 r, }8 x0 o
Turn on the 3rd and leave it on.: n) N0 J2 C+ E3 \2 I
And then go upstairs right away.+ I" P4 e, C, i, |3 _
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Find the answer by using your fingers and eyes% u" l [/ d0 [9 @4 n4 l. 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 * C, s& j; x! b, \7 S9 m/ r
Turn on the first for one min and then turn it off. 9 N" F" \" h" s& vTurn on the 2nd for five min and then turn it off. v3 k! Y/ E8 j4 }9 V- [: O
Turn on the 3rd and leave it on. 1 |8 @. Q6 l- h, QAnd then go upstairs right away." [$ T% ?. o6 c$ x( @
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Find the answer by using ...