Turn on the first for one min and then turn it off. 2 N) l* ^$ f! v4 ^Turn on the 2nd for five min and then turn it off. & M4 o6 N8 m% c, MTurn on the 3rd and leave it on. 1 L9 y* C( J! `5 M1 o" _) cAnd then go upstairs right away.7 m! p% @. c% V
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Find the answer by using your fingers and eyes 6 s5 C, q7 s! u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 9 Q5 m+ V0 @! V& \& x0 B
Turn on the first for one min and then turn it off." [% S# S1 T$ A6 w7 z- T
Turn on the 2nd for five min and then turn it off.2 {/ i. M+ P k( i5 [2 |" b
Turn on the 3rd and leave it on. * f7 K6 `: b# ^9 y5 \$ ^And then go upstairs right away.% _. `+ E! R6 x8 l