家庭的用电都是交流电，为何会有零线和火线的区别？ 知乎 Sketch Coloring Page

家庭的用电都是交流电，为何会有零线和火线的区别？ 知乎 Template

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tomski家庭的用电都是交流电，为何会有零线和火线的区别？ 知乎 coloring

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