In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet.
Open Shortest Path First (OSPF) is a (36) routing algorithm that (37) work clone on the OSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing, requires (38) processing power. The (39) algorithm is used to calculate routes. OSPF routing table updates only take place when necessary, (40) at regular intervals.

A．Bellman-Ford

B．Ford-Fulkerson

C．Dijkstra

D．RIP

急性心肌梗死时，可不出现病理性Q波的情况是（）

A.心肌梗死发生在基底部

B.心肌梗死发生在前壁

C.心肌梗死发生在下壁

D.梗死的心肌直径>20~30mm

E.梗死的心肌厚度>5mm