Turn on the first for one min and then turn it off. . N0 J) w* c% t' w LTurn on the 2nd for five min and then turn it off. ' U: F( w3 J0 |1 hTurn on the 3rd and leave it on. $ N. Y- M6 U( T/ n: q6 x; `% Q% QAnd then go upstairs right away.- ?5 ^1 t9 O4 A7 u! Y. p
4 m2 _. ~9 W) b9 f( qFind the answer by using your fingers and eyes & `& c! |. L6 X4 Q4 B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 ; K" z a' S1 R; B- |3 X4 r- nTurn on the first for one min and then turn it off.% e. ^+ t6 e& z2 l1 L5 W
Turn on the 2nd for five min and then turn it off. . i+ g" j/ r4 jTurn on the 3rd and leave it on.4 P% V$ I" V/ T6 K1 c B
And then go upstairs right away.3 j5 r9 U3 J0 e& o; }6 I( j5 o/ A
. R* ]9 N# j0 Y) }" N
Find the answer by using ...