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【判断题】

USB 接口支持设备的即插即用和热插拔功能,可用于连接多达127种外设,如鼠标、调制解调器和键盘等。

A.
正确
B.
错误
举报
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 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】即插即用硬件与非即插即用硬件之间的区别主要在于()。

A.
是否需要手动安装驱动程序
B.
是否需要插到主机内部
C.
是否需要通电

【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】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

【单选题】Windows 7操作系统具有“即插即用”功能,下列关于“即插即用”的说法正确是 ( )

A.
增加新的硬件后,自动检测该硬件,并提示驱动程序,自动安装
B.
增加新的硬件后,不必安装硬件驱动程序
C.
增加新的硬件后,不能再安装其他硬件
D.
增加新的硬件后,需要同时安装相应系统软件