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Câu 57: Trong ví dụ nào sau đây, chúng ta có được dữ liệu chéo?A. Giá xăng dầu tại Việt Nam qua các thời kì.B. Diễn biến tỷ giá hổi đoái VNĐ/USD được công bố bởi Ngân hàng nhà nướcC. Tốc đô tăng trưởng GDP của các nước trên thế giới năm 2015.D. Số lượng khách đến du lịch hàng năm tại các quốc gia Đông Nam Á giai đoạn từ năm 2010 đến nay.

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