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问题 单项选择题

下列关于Cache的描述中， (39) 是错误的。

A．Cache是缓冲技术在存储体系中的一个具体应用

B．Cache的主要特点之一是存储容量大

C．Cache处于内存和CPU之间

D．Cache中一般存放内存的一部分副本

答案

参考答案：B

解析：

[分析]：
本题考查Cache的概念、作用和特点。
Cache即高速缓冲存储器，具有容量小、速度快的特点。
Cache的作用是为了提高CPU数据输入/输出的速率，解决内存与CPU处理速度不协调问题。一般用于内存和CPU之间。它利用的是程序的局部性原理，将存放在内存中的作业的一部分副本存放在其中。

单项选择题

All her life, my mother wanted busy children. It was very important that her house should remain at all times clean and tidy.
You could turn your back for a moment in my mother’s house, leave a half written letter on the dining table, a magazine open on the chair, and turn around to find that my mother had "put it back where it belonged," as she explained. My wife, on one of her first visits to my mother’s house, placed a packet of biscuits on an end table and went to the kitchen to fetch a drink. When she returned, she found the packet had been removed. Confused, she set down her drink and went back to the kitchen for more biscuits, only to return to find that her drink had disappeared. Up to then she had guessed that everyone in my family held onto their drinks so as not to make water rings on the end tables. Now she knows better.
These disappearances had a confusing effect on our family. We were all inclined to forgetfulness, and it was common for one of us, upon returning from the bathroom, to find the every sign of his work in progress had disappeared suddenly. "Do you remember what I was doing" was a question frequently asked, but rarely answered.
Now my sister has developed a secondhand love of clean windows, and my brother does the cleaning in his house, perhaps to avoid having to be the one to lift his feet. I try not to think about it too much, but I have at this later time started to dust the furniture once a week.

This passage mainly tells us that

A．my mother often made us confused
B．my family members had a poor memory
C．my mother helped us to form a good habit
D．my wife was surprised when she visited my mother
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单项选择题

采煤工作面单体支柱初撑力的合格率必须达到（）以上.

A、70m

B、80m

C、90m
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