What is the most likely reason that an IBGP route that has been selected as a best route is not entered into the IP routing table?（） [" Route reflectors are not passing updates properly."," BGP synchronization has been enabled."," The next-hop address is unreachable."," No loopback interface has been configured on a router."]
下列属于工程项目信息化管理的目标实施的主要方法的有（）。 ["A.合同目标的信息化管理 ","B.全面协调目标的信息化管理 ","C.质量、安全、成本、进度目标的信息化管理 ","D.社会目标的信息化管理 ","E.构建扁平网络状的组织管理模式"]
树的表现，先要抓住大的形体，概括基本形态。
拟定重力坝剖面的主要原则有（） ["保证大坝安全运用，满足稳定和强度要求","尽可能节省工程量，力求获得最小剖面尺寸、造价最低","坝体的外形轮廓简单，便于施工","运行方便"]
全位错
票据具有哪些特征？
