題目:項(xiàng)目反應(yīng)理論中,用于描述項(xiàng)目對(duì)考生能力區(qū)分程度的統(tǒng)計(jì)量是?A. 項(xiàng)目難度B. 項(xiàng)目區(qū)分度C. 項(xiàng)目信息量D. 項(xiàng)目猜測度