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．but rather

B．rather too

C．rather than

D．rather that

属于水杨酸类的药物

A．吲哚美辛

B．对乙酰氨基酚(醋氨酚)

C．布洛芬

D．保泰松

E．阿司匹林