在页式虚存管理系统中,假定驻留集为m个页帧(初始所有页帧均为空),在长为p的引用串中

题型:问答题

问题:

在页式虚存管理系统中,假定驻留集为m个页帧(初始所有页帧均为空),在长为p的引用串中具有n个不同页号(n>m),对于FIFO、LRU两种页面置换算法,试给出页故障数的上限和下限,说明理由并举例说明。

考点:普通考研计算机学科专业基础综合考研操作系统
题型:问答题

阅读理解。

     Lisa goes shopping with her mother. Her mother wants to buy some food. Lisa wants to buy a

new skirt. They come to a shop. Lisa and her mother go in. There are many people in the shop. Lisa

finds a nice pink skirt. "How much is the skirt?" Lisa asks the girl in the shop."It's ninety yuan.""That's

too dear. Can I find a cheap one?"" What about the green one? It looks nice.  And it's only thirty yuan."

"OK, I'll take it. Thanks a lot.""You are welcome." After that, Lisa buys some school things, too. Her

mother buys a lot of food, like bread, cakes, meat and fish.

1. Lisa goes shopping with _____.      

A. her sister    

B. her friend    

C. her mother  

D. her father

2. Lisa wants to buy a new _____ .       

A. shirt      

B. skirt     

C. bag      

D. hat

3. The pink skirt is _____        

A. ¥30    

B. ¥9    

C. ¥80    

D. ¥90

4. Lisa buys a _____ skirt.       

A. white     

B. green      

C. red        

D. dear

5. The green skirt is _____.       

A. nice but dear                  

B. nice and cheap      

C. not nice but cheap              

D. not nice or cheap

题型:问答题

下列关于棉织品的标准配置理解不正确的是哪项()?

A.床单、被套:床位数与可用数之比不足1:2.7时,及时申购

B.酒店毛巾、浴巾、地巾初始配置数量=客房数*3.1(取10整数)

C.开业满一年的酒店可根据情况申购毛巾,申购数位客房数*0.5

D.毛巾、浴巾按不同围边颜色分别配置

题型:问答题

如图所示是一个由电池、电阻R、电键S与平行板电容器组成的串联电路,电键闭合。在增大电容器两极板间距离的过程中:

A.电容器的电容变小 

B.电阻R中没有电流

C.电容器两极板间的电场强度增大

D.电阻R中有从a流向b的电流

题型:问答题

如何证明金刚石、石墨、C60是由同一种元素组成的单质?

题型:问答题

飞机在飞行中机翼上的燃油质量力一般说来()

A.对机翼的剪力和弯矩没有影响

B.增加由气动力引起的剪力和弯矩

C.起减小机翼横截面上剪力和弯矩的作用

D.只会降低由气动力引起的剪力

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