Open Shortest Path First (OSPF) is a (66) routing algorithm that (67) work done on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (68) processing power. The (69) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (70) at regular intervals.

A．Bellman-Ford

B．Ford-Fulkerson

C．Dijkstra

D．RIP

放射性核素肝胆显像剂延迟显像诊断原发性肝癌的优点是（）

A.FP阴性肝癌的定性、定位诊断。

B.虽可检出2cm以下肝癌病灶，但检出率较低

C.肝门区肿瘤因受胆道系统影响而难以检出，容易漏诊

D.可用于AFP阴性肝癌的定性、定位诊断

E.局部胆汁淤滞造成的假阳性