Turn on the first for one min and then turn it off.7 q( g! _* j8 b8 k' P2 k
Turn on the 2nd for five min and then turn it off.8 y' r+ j" A, p. r. p" d
Turn on the 3rd and leave it on. 1 Y$ i8 Z E* O8 U- HAnd then go upstairs right away. " d z# U" x" P' e 1 A, u" [7 D7 l# \" T) Q+ AFind the answer by using your fingers and eyes) r1 d3 v7 O3 Q& s
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 + _7 \! f# ?3 C, h8 d6 j
Turn on the first for one min and then turn it off. : {) P6 X7 a4 ]) \, Y# [! G4 sTurn on the 2nd for five min and then turn it off.% ]" I1 p, x z/ n) j/ F
Turn on the 3rd and leave it on. , W( N2 t! n8 Y: h2 b5 dAnd then go upstairs right away." ~, G' X7 L$ |$ \/ u7 m