首页
普通专升本
成人高考
学位英语
在线刷题
最近学习
最近学习课程
最强大脑 · 3天挑战极限记...
副标题副标题副标题副
最强大脑 · 3天挑战极限记...
副标题副标题副标题副
您现在位置：
模拟考场
>
湖北自学考试
>
公共课
>
计算机网络原理
>
浏览试题
[单选题]
定义了为建立、维护和拆除物理链路所需的机械的、电气的、功能的和规程的特性的层次是( )
A
物理层
B
数据链路层
C
网络层
D
传输层
收藏
查看答案
参考答案
试题答案：
A
答案解释：
【解析】物理层定义了为建立、维护和拆除物理链路所需的机械的、电气的、功能的和规程的特性，其作用是使原始的数据比特流能在物理介质上传输。具体涉及接插件的规格，“0”、“1”信号的电平表示，收发双方的协调等内容。
相关题目
路由器和网桥的主要区别是什么？
37.
一次只能由一个设备传输信号，通常采用分布式控制策略来确定哪个站点可以发送的拓扑结构是( )
网络协议中涉及用于协调与差错处理的控制信息的要素是( )
在计算机网络中，负责信息处理的是( )
下列不属于网络协议的组成要素的是( )
能检测出每列中的所有奇数位错，但检测不出偶数位的错，对差错的漏检率接近于1/2的方法是( )
什么是局域网？局域网具有哪些特点？
19．单体系统也称程序系统，其设计方法为
14．每台主机的IP地址是
热门试题
1.
21.Today we remember a man who was considered one of the best teachers in the United States. Jaime Alfonso Escalante was born in 1930 in La Paz, Bolivia. Both his parents were teachers. He taught math and science in his home country for twelve years. In the 1960s, Jaime Escalante and his wife Fabiola came to the United States. During the next several years, he learned to speak English and repeated his college education and teacher training. In 1974, Mr. Escalante was hired at GarfieldHigh School to teach mathematics. The school was in a poor area of Los Angeles, California. Many of the students had serious problems with illegal drugs, gangs and violence. Many were the worst students at the school and thought to be “unteachable”. But Mr. Escalante pushed the group to work hard. He told them basic math was too easy and that they had the ability to do harder work. He told his students that he believed in them, but they must have the desire to be successful. Jaime Escalante started an advanced math program with a small group of students. Advanced Placement is a program of college-level classes and tests. In 1982, 18 of his students took the Advanced Placement test in calculus. They all passed. Officials at the testing company suspected the students of cheating. Mr. Escalante protested. He said the students were being rejected because they were Hispanic and from a poor school. He urged his students to take the test again. Twelve of the students repeated the test. And again, all of them passed. Five earned top scores. Mr. Escalante's students went on to become engineers, scientists and university professors. The advanced math program at Garfield became extremely successful over the next several years. Jaime Escalante received many teaching awards including the Presidential Medal of Excellence in Education. A movie about his success, “Stand and Deliver”, was released in nineteen eighty-eight. It influenced other teachers to use his methods.(10分)21.1 What did Mr. Escalante do after he came to the US?(2分)A. He taught math and science in a local school.B. He went to a college to learn calculus.C. He learned to speak English and got trained on teaching.D. He started an advanced math program in a college.
2.
简答应激状态形成的条件有哪些?
3.
金融寡头在经济上的统治主要是（ ）
4.
15．Alexander Pope strongly advocated neoclassicism，emphasizing that literary works should be judged by____rules of order,reason，logic，restrained emotion， good taste decorum．
5.
下列选项中，属于企业期间费用的有
热门试卷
成人高考专升本《政治》模拟试卷
去做题
已有3418做题
2020年湖北成人高考专升本政治模拟试题三
去做题
已有2214做题
成人高考专升本政治考试模拟试题及答案(1)
去做题
已有1901做题
湖北成考专升本政治真题（2021年）
去做题
已有1365做题
湖北成考高起点语文真题（2021年）
去做题
已有1232做题
