[名词解释] 聚类分化群(cluster of differentiation,CD)
[主观题]Product differentiation产品差别
[主观题]差别寡头(differentiation oligopoly)
[名词解释] 差别寡头(differentiation oligopoly)
[名词解释] Product differentiation产品差别
[名词解释] terminal differentiation(终末分化)
[名词解释] cell differentiation (细胞分化)
[单选题]gray level differentiation是()A . 线分辨力B . 灰度分辨力C . 穿透力D . 空间分辨力
[名词解释] cluster sampling