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问题 单项选择题

Internet由多个网络层次组成，下列不是构成Internet的网络层次名称的是

A．核心网

B．骨干网

C．区域网

D．用户公用网

答案

参考答案：A

解析： Internet由多个网络层次组成，主要有骨干网、区域网、用户公用网等。

单项选择题

一男性病人，25岁。近一周来中度发热，明显乏力，厌油腻食物。查体：肝大、有触痛，此病人还可能伴有的体征是（）。

A．结膜充血

B．角膜Kayser-Fleischer环

C．巩膜黄染

D．结膜出血点

E．角膜溃疡
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单项选择题

For users, microkernel technology promises (90) , compact and sophisticated operating systems that are typically (91) across a range of hardware platforms. These operating systems will be customizable to let users run multiple operating system and application "personalities" on top of a single microkernel (92) .
Microkernel based systems can provide this flexibility because the core operating system functions are (93) from the large number of utilities, features and extensions that are layered on top of them. As a result, updating and maintaining operating system is easier, since developers don’t have to modify the (94) every time they must acid a new feature.

A．core

B．center

C．heart

D．utility
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