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wendychu2003
2 năm trước
Tại sao trong các lớp học,người ta lắp nhiều bóng đén ở các vi trí khác nhau mà không dùng bóng đèn lớn 2:khi xảy ra hiện tượng nhật thực ,có phải tất cả mn ở trên TĐ có thể quan sát dc không?giải thích
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