作为判定肺泡弥散功能指标的是
A.弥散量B.气体与血红蛋白的结合力C.通气/血流比值D.肺泡毛细血管血流速E.CO2与O2之比
参考答案:A
The network layer provides services to the transport layer. It can be based on either(71). In both cases,its main job is (72) packets from the source to the destination. In network layer,subnets can easily become congested,increasing the delay and(73)for packets. Network designers attempt to avoid congestion by proper desing,Techniques include (74) 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,traffic shaping,resource(75),and admission control. Approaches that have been designed for good quality of service include integrated services (including RSVP), differentiatd services, and MPLS.
空白处(74)应选择()
A.abandonment
B.retransmission
C.checksum
D.synchronism
致神经炎作用最强的周围神经髓鞘抗原为()
A.P0蛋白
B.P1蛋白
C.P2蛋白
D.髓鞘结合糖蛋白
E.神经节苷脂