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【单选题】

集团配备的CDMA通信车卫星传输系统采用的调制解调器选用ComteCh公司的产品,型号为CDM-625L输出频率范围是()。

A.
950-1700MHz
B.
50-180MHz
C.
12000-12750MHz
D.
14-14.5GHz
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参考答案:
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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 interface (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】光终端盒是光传输系统中一个重要的配套设备,光终端盒的作用是()。

A.
将光缆和尾纤进行熔接
B.
光路调接
C.
尾纤存储
D.
包含以上三种作用

【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

【多选题】有线传输系统的传输媒质包括()。

A.
架空明线
B.
同轴电缆
C.
通信光缆
D.
电磁波
E.
微波

【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
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 interface (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】光终端盒是光传输系统中一个重要的配套设备,光终端盒的作用是()。
A.
将光缆和尾纤进行熔接
B.
光路调接
C.
尾纤存储
D.
包含以上三种作用
【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
【多选题】有线传输系统的传输媒质包括()。
A.
架空明线
B.
同轴电缆
C.
通信光缆
D.
电磁波
E.
微波
【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
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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