Turn on the first for one min and then turn it off.- }" R; Z( i! n) M# {) w
Turn on the 2nd for five min and then turn it off.0 N: n6 |2 j2 o" f) J
Turn on the 3rd and leave it on. / `4 ?2 W: K- w' m( i+ S3 pAnd then go upstairs right away.- O1 ?3 E! ]; H d* P T7 k
( V- Z/ `/ Y1 V8 l2 N# OFind the answer by using your fingers and eyes 2 W0 {# z4 |; T y* n* | H* 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 % U) V8 S) ^ g. yTurn on the first for one min and then turn it off. 6 O" u, o; E, \( s' C2 j7 uTurn on the 2nd for five min and then turn it off.# j6 W' q- V9 k: J8 R# o- z
Turn on the 3rd and leave it on. 3 f# D. I6 @/ Z, IAnd then go upstairs right away. ' t- ]/ j0 b$ q: q2 b& F5 ]7 u" K( N& U" X3 P" b3 i4 r: E7 a
Find the answer by using ...