问题 单项选择题

无规则型构型系统可靠性高,但是结构复杂,为了实现正确的传输必须采用( )。 Ⅰ.异步传输技术 Ⅱ.路由选择算法 Ⅲ.流量控制技术 Ⅳ.加密解密技术

A.Ⅰ和Ⅱ

B.Ⅰ和Ⅲ

C.Ⅱ和Ⅲ

D.Ⅱ和Ⅳ

答案

参考答案:C

解析: 网状拓扑的结点之间的连接是任意的,也称为无规则型。它可靠性高,结构复杂,广域网基本上都采用这种构型。网状拓扑的优点是系统可靠性高,但是结构复杂,必须采用路由选择算法与流量控制方法来实现正确的传输。

改错题

第二卷   写作(共35分)

第四部分:书面表达(共两节,35分) 

第一节短文改错(共10小题;每小题1分,满分10分)

此题要求改正所给短文中的错误。对标有题号的每一行作出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

此行缺一个词:在缺词处用一个漏字符号(^),在该行右边横线上写出该加的词。

此行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

On March 12th, we went to plant trees on the hill near to    76.        

our school.  The boys were made dig pits(坑).The         77.       

girls were told to plant the young trees into the pits.        78.       

All of us worked very hardly. Soon we were all wet         79.         

with sweat. After the young trees planted, we               80.                 

began to water it. The water was at the foot of              81.                 

the hill.  But we stood in line to pass pails(桶)             82.                

of water from one to other up to the hill.                  83.        

We did not finish water the trees until it                   84.         

was dark. Though we were tired, we feel very happy.        85         

单项选择题