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hanhdung110907
2 năm trước
Câu 10. Sóng là: A. sự chuyển động của nước biển thành những vòng tròn lên xuống theo chiều thẳng đứng. B. sự dao động tại chỗ của nước biển. C. hiện tượng nước biển lên xuống theo chu kì. D. đáp án a,b đúng.
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