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lele260721
2 năm trước
đánh dấu câu trả lời đúng, tiếng vang là: a/ âm phản xạ b/ âm phản xạ đến cùng lúc vs âm phát ra c/ âm px truyền đi mọi hướng, ko nhất thiết phải truyền đến tai d/ âm px nghe đc cách biệt vs âm phát ra
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