Turn on the first for one min and then turn it off.3 u# a' ]; v3 w# q, a
Turn on the 2nd for five min and then turn it off. 0 |! E6 r" c( G( STurn on the 3rd and leave it on. 7 {: ~, y# W- z. `( E) SAnd then go upstairs right away.# q5 f5 T2 O4 Y6 O7 V% H( ^( m
: ?( f+ ~+ Y3 [5 `, R- f: H y2 sFind the answer by using your fingers and eyes * @' @9 j! U9 \5 ^) z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 # C! z9 u" B7 [( [
Turn on the first for one min and then turn it off. % q1 S7 r* _% T# B STurn on the 2nd for five min and then turn it off.! q# H8 \( l- l2 H/ T; K
Turn on the 3rd and leave it on. ( Z8 m( y3 e( M4 K) P; C; D! yAnd then go upstairs right away.7 t; [0 p+ e9 J, T
+ q1 W3 S. \) q- U# }% kFind the answer by using ...