多项选择题 路由器配置 RIP 协议，并在接口（ 10.0.0.1/24）所在网段使能 RIP 路由协议，以下哪些命令是必须的？A.rip B.rip 10.0.0.0C.network 10.0.0.0 255.255.255.0D.network 10.0.0.0
单项选择题 An graft is a surgical operation where a failing or damaged organ in the human body is removed and replaced with a new one. A.对B.错
单项选择题 COPD is a group of disorders characterized by airflow obstruction.A.对B.错