Turn on the first for one min and then turn it off. 7 X% t! V- l3 p% iTurn on the 2nd for five min and then turn it off.- B8 Z* K: {0 O
Turn on the 3rd and leave it on. 2 i4 x+ k1 `4 F7 G& P1 C0 dAnd then go upstairs right away. 4 q( r# j0 J4 y6 n4 A( W/ a4 V : n0 @- {$ e# G) }2 ?5 NFind the answer by using your fingers and eyes9 E4 k) Q7 X7 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 % D( U% O& ^+ F) M! J2 ~
Turn on the first for one min and then turn it off.1 O1 g9 ^4 V R& U+ e* O& `) f
Turn on the 2nd for five min and then turn it off. * y4 u6 [- d4 X! KTurn on the 3rd and leave it on. % Z2 O! l* g. h7 F7 s. uAnd then go upstairs right away." C) T% x, F( N3 s/ ~
, x& C9 ~; h P0 |4 A: r9 l) n* b t
Find the answer by using ...