既然日常中用的是交流电,那为什么还有火线、零线之分? 知乎 Template




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Try and sketch some of thesePlow, Arcade, Pentacle, Cruise ship, Diaper, Spear, Ogre, Beets, Mashed potatoes, Quirt, view more ideas


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tomski既然日常中用的是交流电,那为什么还有火线、零线之分? 知乎 coloring