Turn on the first for one min and then turn it off./ [' ^+ d4 a8 Z* ?$ _6 W4 ]* m
Turn on the 2nd for five min and then turn it off. : A; a& x2 X, R- i$ z# W' G5 pTurn on the 3rd and leave it on. 1 T; G, ]5 L* M4 m6 d: XAnd then go upstairs right away. 3 a1 J" v# X K; Y5 S , { b1 r7 a. P% d% n& iFind the answer by using your fingers and eyes ) ~, m8 l0 t/ k2 k" ~: D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 % X! F6 N/ U7 l( ~! qTurn on the first for one min and then turn it off." a" D3 K0 k: N. W# G; S
Turn on the 2nd for five min and then turn it off.! H6 g/ w3 w1 {
Turn on the 3rd and leave it on. 2 L9 r% z3 A. z( ~And then go upstairs right away. ( x) W2 Q8 u5 h G& ^# F3 r Z! N! d
Find the answer by using ...