内镜的灭菌宜用______
A.紫外线照射 B.煮沸法 C.1%漂白粉溶液擦拭D.戊二醛溶液浸泡 E.40%甲醛熏蒸
参考答案:D
20世纪30年代,将“角色”一词引入社会心理学的是()。
A.弗洛伊德
B.奥地利精神分析学派
C.美国芝加哥学派
D.人本主义
E.行为主义
The network layer provides services to the transport layer.It can be based on either (67) .In both cases,its main job is (68) packets from the source to the destination.
In network layer,subnets can easily become congested,increasing the delay and (69) for packets.Network designers attempt to avoid congestion by proper design.Techniques include (70) policy,caching,flow control,and more.
The next step beyond just dealing with congestion is to actually try to achieve a promised quality of service.The methods that can be used for this include buffering at the client,trafficshaping,resource (71) ,and admission contr01.Approaches that have been designed forgood quality of service include integrated services(including RSVP),differentiated services,andMPLS.
67()
A.TCP or UDP
B.packets or segments
C.virtual circuits or datagrams
D.IP or IPX