回复：有梯子么？

来源: susan_xv 于 2011-01-14 20:13:48 [档案] [旧帖] [给我悄悄话] 本文已被阅读： 0 次 (236 bytes)

回答: 有梯子么？由让板砖飞一会儿于 2011-01-14 19:51:55

1。turn on one switch for a while, then turn off.

2. turn on another.

3. go upstairs to check which one is on.

4. Then feel one of the reminder. The one is still hot matches the first switch.

5....

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