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Đặc điểm nào sau đây là của vận chuyển chủ động qua màng tế bào:A. Chất vận chuyển không kết hợp với một chất nào khácB. Không cần năng lượng của tế bàoC. Có thể đi ngược chiều gradient nồng độD. Vận chuyển theo 2 chiều
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