Turn on the first for one min and then turn it off.9 z1 J9 B2 ~/ `# W B0 J
Turn on the 2nd for five min and then turn it off. ) |$ E+ y6 g; p2 d( x; N5 E2 sTurn on the 3rd and leave it on.' }- i; Z4 q7 Z1 P
And then go upstairs right away. 7 t+ I1 ^6 W) Y$ y# q; @7 H9 u! B: S3 f {( z8 t' `
Find the answer by using your fingers and eyes" Q5 ^& ^: }$ ?4 c4 D. P
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 ) ~3 O4 ?, w8 K0 l
Turn on the first for one min and then turn it off. # N& N/ {2 E3 W9 y' p; ZTurn on the 2nd for five min and then turn it off.9 K5 m6 u2 O$ Y8 G5 I
Turn on the 3rd and leave it on.. M R, G2 {) l, Q0 H
And then go upstairs right away. 4 p' O; F: J$ ]: a2 o4 D( j! p" O1 l1 x* F( ]( x$ |/ {: p
Find the answer by using ...