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问题 填空题

用干绸布擦拭穿衣镜，会发现擦过的镜面很容易吸上细小绒毛，这是由于此时的镜面因______而带了电，带电体有______的性质．

答案

用干绸布擦拭穿衣镜，会发现擦过的镜面很容易吸上细小绒毛，这是由于此时的镜面因 摩擦而带了电，带电体有 吸引轻小物体的性质．

故本题答案为：摩擦；吸引轻小物体．

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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单项选择题

在建设工程的施工过程中，材料检验和隐蔽工程的验收属于（）。

A.事前控制

B.事中控制

C.事后控制

D.全面控制
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