男，68岁，慢性咳嗽、咳痰20年，5年来气短逐渐加重，3天前受凉发_爱下问搜题

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问题单项选择题共用题干题

男，68岁，慢性咳嗽、咳痰20年，5年来气短逐渐加重，3天前受凉发热（39.6℃），咳黄痰，呼吸困难，夜不能平卧，尿少，双下肢水肿来急诊

经急诊简单检查处理后收入病房，经治医生采取以下的处理措施中，哪一项对肺通气功能有效（）.

A.选用有效抗生素

B.应用氨茶碱扩张支气管

C.给予镇静剂，减轻烦躁不安

D.持续低流量吸O₂

E.少量利尿剂消除水肿，减轻心脏前负荷

答案

参考答案：C

填空题

卵巢的（）对放疗高度敏感。

单项选择题

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