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【单选题】Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals (i. e., those without processing capability)simply a...
A.
Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals (i. e., those without processing capability)simply access the information base via programs stored on the system. Personal computer (PC) users typically access the host through a modem (调制解调器). A PC software program serves as an intece (接口)between the server and a PC, allowing the user to operate through the online system and select different databases using a keyboard or a mouse.
B.
National and regional online systems usually have local telephone numbers that PC modems can call to access either a local information base or an indirect long-distance connection, thus reducing long-distance telephone fees. Some online systems allow users ’to copy large volumes of information onto a local memory storage device, which also reduces the time the user is connected to the online system.
C.
Besides offering a great number of different information based, ranging from full-text journal li- braries to reports of missing children, online services allow users to, for example, reserve airline tick- ets, buy stocks, purchase goods, and communicate with other users. In exchange for the service, users usually pay a monthly membership fee. They may also pay to connect to various databases on the service or to download information.
【单选题】ITU V90调制解调器(MODEM)______。
A.
下载速率是56kb/s，上传速率是33.6kb/s
B.
上下行速率都是56kb/s
C.
与标准X.25公用数据网连接，以56kb/s的速率交换数据
D.
时刻与ISP连接，只要开机，永远在线
【单选题】研究人员通过大量数据分析:人们心理烦躁的原因可能是对市场经济的剧烈竞争感到疲倦或不适应,也可能是多数人长时间上网后的网络综合症带来的副作用,还有可能是人际关系的不和谐造成的心理负担过重。烦躁心理使社会秩序呈现不良形态,甚至传染他人引起无名的烦乱。 以上分析说明( )。
A.
人们的烦躁心理可对社会产生影响
B.
和谐的社会不会引起人们心理烦躁
C.
比较起来,人际关系是决定人们心理是否烦躁的重要原因
D.
强化知识积累,则能增强适应能力、把握处世尺度,减少心理烦躁的因素
【单选题】调制解调器(Modern)的作用是( )。
A.
将数字脉冲信号转换成模拟信号
B.
将模拟信号转换成数字脉冲信号
C.
将数字脉冲信号与模拟信号互相转换
D.
为了上网与打电话两不误
【单选题】为了防止学生在上网课期间开小差，王老师要求学生公开自己的账号和密码，方便自己随时查看学生听课状态和聊天记录。王老师的做法（ ）。
A.
正确，起到了督促学生的作用
B.
错误，侵犯了学生的人格尊严权
C.
正确，阻止了学生的违纪行为
D.
错误，侵犯了学生的隐私权
【单选题】调制解调器(Modem)的功能是。
A.
将数字信号转换成模拟信号
B.
将模拟信号转换成数字信号
C.
兼有A和B的功能
D.
使用不同频率的载波将信号变换到不同的频率范围
相关题目：
【单选题】Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals (i. e., those without processing capability)simply a...
A.
Online services are managed by a host system that maintains a base of information available to satellite users. Users of so-called "dumb" terminals (i. e., those without processing capability)simply access the information base via programs stored on the system. Personal computer (PC) users typically access the host through a modem (调制解调器). A PC software program serves as an intece (接口)between the server and a PC, allowing the user to operate through the online system and select different databases using a keyboard or a mouse.
B.
National and regional online systems usually have local telephone numbers that PC modems can call to access either a local information base or an indirect long-distance connection, thus reducing long-distance telephone fees. Some online systems allow users ’to copy large volumes of information onto a local memory storage device, which also reduces the time the user is connected to the online system.
C.
Besides offering a great number of different information based, ranging from full-text journal li- braries to reports of missing children, online services allow users to, for example, reserve airline tick- ets, buy stocks, purchase goods, and communicate with other users. In exchange for the service, users usually pay a monthly membership fee. They may also pay to connect to various databases on the service or to download information.
【单选题】ITU V90调制解调器(MODEM)______。
A.
下载速率是56kb/s，上传速率是33.6kb/s
B.
上下行速率都是56kb/s
C.
与标准X.25公用数据网连接，以56kb/s的速率交换数据
D.
时刻与ISP连接，只要开机，永远在线
【单选题】研究人员通过大量数据分析:人们心理烦躁的原因可能是对市场经济的剧烈竞争感到疲倦或不适应,也可能是多数人长时间上网后的网络综合症带来的副作用,还有可能是人际关系的不和谐造成的心理负担过重。烦躁心理使社会秩序呈现不良形态,甚至传染他人引起无名的烦乱。 以上分析说明( )。
A.
人们的烦躁心理可对社会产生影响
B.
和谐的社会不会引起人们心理烦躁
C.
比较起来,人际关系是决定人们心理是否烦躁的重要原因
D.
强化知识积累,则能增强适应能力、把握处世尺度,减少心理烦躁的因素
【单选题】调制解调器(Modern)的作用是( )。
A.
将数字脉冲信号转换成模拟信号
B.
将模拟信号转换成数字脉冲信号
C.
将数字脉冲信号与模拟信号互相转换
D.
为了上网与打电话两不误
【单选题】为了防止学生在上网课期间开小差，王老师要求学生公开自己的账号和密码，方便自己随时查看学生听课状态和聊天记录。王老师的做法（ ）。
A.
正确，起到了督促学生的作用
B.
错误，侵犯了学生的人格尊严权
C.
正确，阻止了学生的违纪行为
D.
错误，侵犯了学生的隐私权
【单选题】调制解调器(Modem)的功能是。
A.
将数字信号转换成模拟信号
B.
将模拟信号转换成数字信号
C.
兼有A和B的功能
D.
使用不同频率的载波将信号变换到不同的频率范围
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