Turn on the first for one min and then turn it off. ) Q! U# W, z2 S& b I# hTurn on the 2nd for five min and then turn it off. " v* }* _# [! c3 q2 E+ FTurn on the 3rd and leave it on. ; f. T2 J! }0 T9 nAnd then go upstairs right away.3 Z0 y' P$ }4 m5 R9 i2 f
2 P5 t5 q- V6 t0 \Find the answer by using your fingers and eyes2 V! {! I J& Z" L& l9 Y
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 ) R5 M; {2 C3 x$ VTurn on the first for one min and then turn it off.1 L2 l4 t, n! L9 m* L. m
Turn on the 2nd for five min and then turn it off. 6 W) @5 S, d$ d+ O" s7 L @Turn on the 3rd and leave it on. & O$ p" C; w% P& T1 i- m: aAnd then go upstairs right away.) [- R; g ~: F6 B
" y( _; X( m$ q. P) x
Find the answer by using ...