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mavuonglau
2 năm trước
Vì sao nguyệt thực thường xảy ra vào đêm âm lịch? Vì sao khi đặt bàn tay ở dưới 1 ngọn đèn điện dây tóc thì bóng bàn tay trên mặt bàn rõ rệt, còn khi đặt dưới bóng đèn điện ống thì bóng bàn tay lại nhòe? Ko chép mạng :)
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