问题
单项选择题
Open Shortest Path First(OSPF)is a (71) routing algorithm that (72) workdone on the OSI IS-IS intradomain routing protocol．This routing，as compared todistance—vector routing，requires (73) processing power．The Dijkstra algorithm is usedto calculate (74) OSPF routing table updates only take place when necessary， (75) atregular intervals．
A．derivedfrom
B．deviatedfrom
C．was derived from
D．was deviated from
答案
参考答案：C