Turn on the first for one min and then turn it off.$ K: J1 A- Z) m- q& P7 n S
Turn on the 2nd for five min and then turn it off.9 y# Z, O( Z; D; T8 B
Turn on the 3rd and leave it on./ x9 e. V, R" \+ `: V' ]# |
And then go upstairs right away./ Q! _5 @ ]7 T$ D7 s, Z) M
% i; { Y& U& f$ Z. `5 f3 D
Find the answer by using your fingers and eyes& L! s6 F& ~9 V8 ^, O) F
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 ' N" r/ P m# m0 K% \5 e1 r
Turn on the first for one min and then turn it off.+ `, s7 r; o6 @ v
Turn on the 2nd for five min and then turn it off. + g6 b$ {9 s$ e; _0 ETurn on the 3rd and leave it on. ! f& m& C) ^- r! u: QAnd then go upstairs right away. 0 W( G. b5 h4 s6 W! o & b, f9 N1 u$ L0 oFind the answer by using ...