Turn on the first for one min and then turn it off.& M% H/ r5 B8 }/ D
Turn on the 2nd for five min and then turn it off.9 P& F6 U5 e- x2 k
Turn on the 3rd and leave it on.& ~7 t/ c9 D3 D7 X3 m) {! u0 V
And then go upstairs right away. + s2 }; k6 O) L/ A# A! Y: \: S0 I A d( v3 a8 p7 y: x9 r
Find the answer by using your fingers and eyes; I1 N N7 A9 K3 N% m/ @ A
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 6 ^7 O- ?" `8 C0 Z) D# o* ~2 CTurn on the first for one min and then turn it off. 1 L: ?- x ~5 }0 P' _ }) zTurn on the 2nd for five min and then turn it off. 9 H9 |# o; t# a- U6 R4 J) ?Turn on the 3rd and leave it on. " o0 q5 Y+ A+ `& h0 L& fAnd then go upstairs right away. ' a2 _5 A5 s! e C; ]) d* q2 o) B' e) p) {( n4 X
Find the answer by using ...