Turn on the first for one min and then turn it off. % D) s! H, B' B6 j8 ]Turn on the 2nd for five min and then turn it off.2 L) n* T/ [" O' D& |- x! l7 `
Turn on the 3rd and leave it on. 2 Z) N- I- ?( H H( FAnd then go upstairs right away.6 ~* \% B8 T: k g
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Find the answer by using your fingers and eyes; h$ n/ J T5 e5 k f9 F4 P
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 0 G5 H& c1 A- ~5 O$ N/ J3 O. ETurn on the first for one min and then turn it off.4 B; X, Y4 I: {8 W6 T4 q4 b8 c, e+ x
Turn on the 2nd for five min and then turn it off. % u0 R% a, ]0 D7 V! _, LTurn on the 3rd and leave it on.1 e6 D6 ~2 F+ ~: m% v' l. {9 v
And then go upstairs right away.7 h. C1 U! Z9 Q) I+ }