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31. Nhân viên KTQT giải thích rằng những sản phẩm có kết cấu chi phí với biến phí lớn hơn định phí khi doanh thu tăng một tốc độ thì :a. Mức lợi nhuận thay đổi rất nhanhb. Mức lợi nhuận thay đổi chậmc. Tốc độ lợi nhuận tăng nhanhd. Tốc độ tăng lợi nhuận chậm

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