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dohuyen031214
2 năm trước
Khi đặt hiệu điện thế 4,5V vào hai đầu một dây dẫn thì dòng điện chạy qua dây dẫn này có cường độ 0,3A. Nếu tăng cho hiệu điện thế này thêm 3V nữa thì dòng điện chạy qua dây dẫn có cường độ là: A. 0,2A B. 0,5A C. 0,7A D0,8A
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