如图所示是用来辨别火线和零线的测电笔的构造图.下列关于测电笔的操作和判断正确的是 A.用手指握住测电笔让笔尖接触电线如氖管不�光表示 Template




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tomski如图所示是用来辨别火线和零线的测电笔的构造图.下列关于测电笔的操作和判断正确的是 a.用手指握住测电笔让笔尖接触电线如氖管不�光表示 coloring