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doanthucquyen51
2 năm trước
đặt vào hai đầu dây dẫn một hiệu điện thế 9V thì cường độ dòng điện qua dây là 0,3A. tăng hiệu điện thế thêm 3V thì cường độ dòng điện qua dây là bao nhiêu
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