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nguyenthihoan1983hh
2 năm trước
Câu 1: "-" là kí hiệu của: A. Cực dương B. Dây pha C. Dòng điện một chiều D. Dây trung tính Câu 2: "~" là kí hiệu của: A. Dây dẫn chéo nhau B. Dây dẫn nối nhau C. Dòng điện xoay chiều D. Đáp án khác
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