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Câu 1 . Dây kim loại trong bóng đèn điện được gọi là gì? Câu 2 . Nhà vật lý thiên tài Albert Einstein được sinh ra ở nước nào? Câu 3 . Tia hồng ngoại có bước sóng quá ngắn hay quá dài so với khả năng nhìn được của mắt người?
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