Turn on the first for one min and then turn it off.- D/ ~/ [( B% N) a0 G
Turn on the 2nd for five min and then turn it off. 7 ^7 _! j% s& a) B" D" YTurn on the 3rd and leave it on.) j6 a6 L% i7 C& Q! c4 c5 T5 ?
And then go upstairs right away. 7 O6 r* A% }% J* f; V7 i# u( ?3 E
Find the answer by using your fingers and eyes) S3 C* T8 H: p/ y, N
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 . [; W+ [) Q- ?* \3 P
Turn on the first for one min and then turn it off. . V$ B% o* f8 A P4 F9 v+ lTurn on the 2nd for five min and then turn it off., A% K+ Y# r+ [
Turn on the 3rd and leave it on.. K* ~8 X8 X- B0 Q2 z! ]9 v
And then go upstairs right away.- ?1 O: f5 ]9 g8 h8 Z
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Find the answer by using ...