Turn on the first for one min and then turn it off.0 J+ n7 e4 V# E" f$ c- ]4 t0 U+ K V
Turn on the 2nd for five min and then turn it off. / j! j9 D9 }; ?, ]7 V5 ATurn on the 3rd and leave it on.8 b ~) o8 g7 h& i& g+ m7 |. h2 ~$ c
And then go upstairs right away., |; ?- B! ~3 f4 k8 A/ _/ f
9 C7 E# k) }# d, F9 K! b" WFind the answer by using your fingers and eyes' V J, @4 f1 v. h5 [
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 ( Y6 U5 r4 O9 N3 h. {
Turn on the first for one min and then turn it off.8 G2 ^# L4 h' I1 o, }
Turn on the 2nd for five min and then turn it off.3 ] y( a! [8 `" _+ g) k
Turn on the 3rd and leave it on.; g/ B9 j* o2 |- p% k5 n; }
And then go upstairs right away.4 j- V+ f, I3 o/ _
' F2 |: p9 q9 w! U4 P3 _Find the answer by using ...