Turn on the first for one min and then turn it off.7 i: T2 f6 X/ K6 \5 ]
Turn on the 2nd for five min and then turn it off.9 |3 ^2 ]8 D7 h$ w% h, x' \
Turn on the 3rd and leave it on.4 H; d; b) O' E; z6 ~9 @
And then go upstairs right away. / \; S; [1 W! ~+ Z; \# i4 X1 z8 D9 o a$ n1 A, T7 A
Find the answer by using your fingers and eyes m5 E) y/ F1 R1 ]2 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 8 l. X& f0 G) {7 o$ O( @4 G- h! W' J
Turn on the first for one min and then turn it off. . T1 r3 f" l2 }Turn on the 2nd for five min and then turn it off. 7 {" I( F( \* W: o6 Q9 cTurn on the 3rd and leave it on.3 I! c: \! `& k- _& k7 \: v
And then go upstairs right away." N. P) m4 X; r7 @( A