題目：項(xiàng)目反應(yīng)理論中，用于描述項(xiàng)目難度與考生能力之間關(guān)系的函數(shù)是？A. 項(xiàng)目特征函數(shù)B. 項(xiàng)目信息函數(shù)C. 項(xiàng)目難度函數(shù)D. 項(xiàng)目區(qū)分度函數(shù)
