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【单选题】
当通过电话线连接到ISP时，因为电话线路输出信号为哪种信号，计算技术输出信号只能通过调制解调器同电话网连接
A.
数字
B.
模拟
C.
音频
D.
模拟数字
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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】CCD(Charge Coupled Device)摄像头输出信号为( )帧/秒(fps——frame per second)。
A.
20
B.
25
C.
30
D.
50
【多选题】云计算技术的发展为开展联网审计提供了哪些机遇?( )
A.
云计算技术在一定程度上可以降低联网审计的实施与运行成本
B.
云计算技术的应用使得研究云计算环境下的联网审计成为必然
C.
政府信息化建设为开展云计算环境下的联网审计提供了机遇
D.
应用云计算技术能更好地满足联网审计环境下大数据分析的需要
E.
云计算技术的应用提高了数据采集的真实性和完整性
【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】● 调制解调器(MODEM)的主要功能是 （5） 。
A.
模拟信号的放大
B.
数字信号的整形
C.
模拟信号与数字信号的转换
D.
数字信号的编码
【单选题】TCD检测器的输出信号通常是( )。
A.
热敏电阻的阻值
B.
热敏电阻的电压
C.
惠斯通电桥的不平衡电压
D.
惠斯通电桥的不平衡电阻
【单选题】Google云计算技术中Bigtable访问控制的基本单元是（）？
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行族
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行键
C.
列族
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列键
【单选题】计算技术站通过能力与改编能力时，（）列车的到、发作业，按固定作业计算。
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B.
行包
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旅客
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路用
【单选题】ABB 标准板DSQC651有（ ）个模拟输出信号.
A.
4
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`1
C.
2
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3
【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】CCD(Charge Coupled Device)摄像头输出信号为( )帧/秒(fps——frame per second)。
A.
20
B.
25
C.
30
D.
50
【单选题】鉴频器输出信号与比较信号（）。
A.
相位差为零
B.
频率一致
C.
频率一致相位差固定
D.
频率一致相位差为零
【判断题】Set指令将数字输出信号置1。
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正确
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错误
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错
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对
【多选题】云计算技术的发展为开展联网审计提供了哪些机遇?( )
A.
云计算技术在一定程度上可以降低联网审计的实施与运行成本
B.
云计算技术的应用使得研究云计算环境下的联网审计成为必然
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政府信息化建设为开展云计算环境下的联网审计提供了机遇
D.
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E.
云计算技术的应用提高了数据采集的真实性和完整性
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正确
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错误
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个人隐私
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能源消耗
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统一标准
【单选题】调制解调器(modem)的主要功能是
A.
模拟信号的放大
B.
数字信号的编码
C.
模拟信号与数字信号的转换
D.
数字信号的放大
【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
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兼有A和B的功能
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使用不同频率的载波将信号变换到不同的频率范围
【单选题】DDZ-III电动调节器输出信号是（）。
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直流0～20mA
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直流4～20mA
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交流0～20mA
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