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18.Chi phí cố định là những chi phía.Không thay đổi khi khối lượng sản phẩm sản xuất thay đổi trong giới hạn công suất thiết kếb.Tổng chi phí có tính ổn địnhc.Khi khối lượng tăng lên trong phạm vi công suất thiết kế thì chi phí đơn vị có xu hướng giảm xuốngd.Cả 3 đáp án trên
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