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qq wen da (5)
Pages: 60
Year: Issue:  11
Journal: School Journal of Mathematics

Keyword:  保险丝灯泡现实生活氖管教育电荷进户线渔舟唱晚开路短路;
Abstract: <正>1.网友“先进的教育”问:晚饭时,小明家的四盏灯泡突然全都熄灭了.经检查发现.邻居家的灯仍然亮着,自己家的保险丝也没烧断,他用测电笔测试家中电路,发现测电笔氖管都发光,则可能是().A.灯泡全都烧坏B.室内线路某处短路C.进户线零线开路D.进户线火线开路“渔舟唱晚”答:四盏灯泡突然同时烧坏,从理论上讲不是没有可能,但在现实生活中这种情况基本上是不可能遇到的,选项A应排除:如果室内线路某处短路,则电
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