Turn on the first for one min and then turn it off. , X! q4 n# i7 ?# ~( oTurn on the 2nd for five min and then turn it off.* ] b3 [$ o: l
Turn on the 3rd and leave it on. ) N! d! y# p, a# l; l0 ^' PAnd then go upstairs right away.5 B% h% b; e9 U
4 g L; G$ m% l/ W U, XFind the answer by using your fingers and eyes: V% L: ^6 p4 b
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 + W* K- U* x0 A; O
Turn on the first for one min and then turn it off.6 J2 F9 W, {0 n
Turn on the 2nd for five min and then turn it off. 9 m" x a/ g, RTurn on the 3rd and leave it on. ! L8 i, O1 b$ ~" Y4 Z! A* J! e2 J5 HAnd then go upstairs right away. ( {2 \! ]+ k9 y( Q5 ^) u# B' |1 F, O& j1 H, R# s: \
Find the answer by using ...