上消化道内镜检查的禁忌证是()
A.消化性溃疡急性出血
B.消化性溃疡并发急性穿孔
C.消化性溃疡并发幽门梗阻
D.胃溃疡疑有癌变
E.消化性溃疡药物治疗后疗效观察
参考答案:B
企业档案管理学的基本研究对象是()。
A、企业档案
B、企业档案管理
C、企业档案工作
Open Shortest Path First(OSPF)is a (71) routing algorithm that (72) work done on theOSI IS-IS intradomain routing protocol. This routing, as compared to distance-vector routing,requires (73) processing power. The (74) algorithm is used to calculate mutes. OSPFrouting table updates only take place when necessary, (75) at regular intervals.
A.but rather
B.rather too
C.rather than
D.rather that