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问题 单项选择题

慢性根尖周致密性骨炎表现为（）

A.根尖周多囊性透射区

B.根尖周弥散性透射区，边缘不整齐

C.根尖部局限性的致密阻射影像

D.牙槽骨破坏，硬板消失，骨小梁变细，牙周间隙增宽

E.根尖周有圆形或椭圆形边界清晰的透射区

答案

参考答案：C

单项选择题

TCP/IP (21) layer protocols provide services to the application (22) running on a computer. The application layer does not define the application itself, but rather it defines
(23) that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (24) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP (25) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

A. services B. processes C. applications D. address
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填空题

交际语言（口头语言）具有直接性、（）、功利性的特点。
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