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81) Thế nào là độ của sự vật:a) Trong một phạm vi, lượng - chất thống nhất với nhaub) Trong một khoảng, lượng và chất thống nhất với nhauc) Duy trì mối quan hệ, lương - chất thống nhất với nhaud) Trong một giới hạn, lượng - chất thống nhất nói lên sự vật là nó

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