Turn on the first for one min and then turn it off. 0 _ a4 G! y2 a) C6 jTurn on the 2nd for five min and then turn it off.& z- E4 [ x9 n. w% L
Turn on the 3rd and leave it on. ( w5 u Z5 r: c: X) uAnd then go upstairs right away. ; K6 h& V, [$ A; @( l2 r- g8 p0 y9 z& q- ~$ q
Find the answer by using your fingers and eyes0 r! K. N0 o4 { P9 K
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 * j5 C7 g) [* H/ T; y$ ?Turn on the first for one min and then turn it off. 6 G3 i, r2 [% xTurn on the 2nd for five min and then turn it off. % A5 U8 @1 t& t/ KTurn on the 3rd and leave it on.+ t: t, A S5 X5 d* R
And then go upstairs right away. + x7 P# i2 F0 G# |$ l- M6 v0 _- X4 l
Find the answer by using ...