按照政务信息资源采集空间范围来划分信息源，可将政务信息源分为（）信息源和（）信息源。
参考答案：内部，外部
电磁感应现象在生产、生活及科学研究中有着广泛的应用，请列举其中利用电磁感应原理工作的器具：①______；②______．
Open Shortest Path First(OSPF)is a (72) routing algorithm that (73) work done on theOSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing,requires (74) processing power. The (75) algorithm is used to calculate mutes. OSPFrouting table updates only take place when necessary, (76) at regular intervals.
A．Bellman-Ford B．Ford-Fulkerson C．Dijkstra D．RIP
