Turn on the first for one min and then turn it off.+ s' Z8 [. c$ t5 U8 ?3 o" u" v
Turn on the 2nd for five min and then turn it off./ D; a; C8 l* v# ^" D0 F
Turn on the 3rd and leave it on. ! B# c0 k+ I( q# ^And then go upstairs right away.& ~- Q& }+ O3 q% U& E' k* Y8 ]
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Find the answer by using your fingers and eyes 7 l% _6 ~/ n% O2 T$ ^$ c. @) }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 ; |' ~$ M- U" ^: mTurn on the first for one min and then turn it off.* s; U) a: N) r3 W/ X
Turn on the 2nd for five min and then turn it off.% t" U0 ^7 q. N( n8 B( h7 ~, T- R i* I
Turn on the 3rd and leave it on./ f+ O3 @- L/ b' a+ B" C( _# `
And then go upstairs right away.' w2 K- _7 Z2 G7 I+ Q( v1 }' P. m0 m