题型:单项选择题 某校园网的地址块是138.138.192.0/20,该校园网被划分为______个C类子网,不属于该校园网的子网地址是______。A.138.138.203.0 B.138.138.205.0 C.138.138.207.0 D.138.138.213.0 查看答案