Turn on the first for one min and then turn it off. ' G% o1 e4 V+ s" A+ a" R4 g7 t! oTurn on the 2nd for five min and then turn it off. ) V5 \1 G% z; q( n L4 wTurn on the 3rd and leave it on., p0 J% a6 f% _$ z4 Q
And then go upstairs right away. ( d" @) q( c [3 ]/ c0 a2 A6 }! n* L$ w9 l! `4 N
Find the answer by using your fingers and eyes 6 u' d! b6 L! x0 F$ `3 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 + u4 s8 P- O) I T5 q+ B
Turn on the first for one min and then turn it off.% y* W. p4 k h8 s
Turn on the 2nd for five min and then turn it off.: [3 t9 C: n: u
Turn on the 3rd and leave it on. 1 u j. V6 \2 s( v8 ?And then go upstairs right away.6 S( K/ P+ \; s