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问题 单项选择题 A3/A4型题

患者男性，28岁，3年前因外伤后根折而拔除，现要求修复，检查：见患者缺牙间隙小，余留前牙问有散在间隙

影响固定桥桥体挠曲变形的最主要因素是（）

A.桥体长度

B.桥体厚度

C.桥体宽度

D.力大小

E.桥体材料

答案

参考答案：D

多项选择题

卡氏肺囊虫肺炎的特点包括（）

A.早期影像表现不明显，肺门旁见淡片影

B.病变发展迅速，几小时或几天内病变融合呈两肺门旁蝶翼状影

C.病变主要累及肺间质，为间质性炎症

D.病变与肺水肿、细菌性肺炎或混合感染不易鉴别

E.CT较平片发现病变敏感，且可以为病灶活检定位
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单项选择题

Networks can be interconnected by different devices. In the physical layer, networks can be connected by (11) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept (12) ,examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have (13) network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (14) . As an example, gateways between Internet e-mail and X.400 e-mail must (15) the e-mail message and change various header fields.

11（）

A.repeaters

B.relays

C.packages

D.modems
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