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nguyengiangnthg918
2 năm trước
. Đèn huỳnh quang khi mới bật có hiện tượng nhấp nháy sáng là do: A. Do lớp bột huỳnh quang phát sáng B. Do tắc te hỏng C. Do tần số dòng điện 50Hz xoay chiều D. Do đèn sắp hỏng
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