首页
登录
职称英语
Online services are managed by a host system that maintains a base of inform
Online services are managed by a host system that maintains a base of inform
游客
2023-09-22
40
管理
问题
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 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.
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.
Besides offering a great number of different information bases, ranging from full-text journal libraries to reports of missing children, online services allow users to, for example, reserve airline tickets, 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.
选项
A、a base of information
B、dumb terminals
C、a host system
D、a satellite
答案
A
解析
本题为推理题。根据文章第一段第一句话"Online services are managed by a host system that maintains a base of information available to satellite users.”可知,网络服务通过中央系统来管理,而中央系统则具有供网络使用者用的信息库。由此可见,网络服务为使用者提供信息库。因此答案为A。
转载请注明原文地址:https://tihaiku.com/zcyy/3035594.html
相关试题推荐
DearSir/Madam,Wehappenedtofindrichinformationabout2009IBMnewprod
DearSir/Madam,Wehappenedtofindrichinformationabout2009IBMnewprod
A—judicialsystemB—InsuranceLawC—criminalpr
A—judicialsystemB—InsuranceLawC—criminalpr
A—judicialsystemB—InsuranceLawC—criminalpr
A—judicialsystemB—InsuranceLawC—criminalpr
Welcometooursmallbusinessset-upguide,providingalltheinformationyo
Pleasereadthroughtheinformationbelowbefore(fill)______inyourapplication
A--judicialsystemB--InsuranceLawC--crimina
A--judicialsystemB--InsuranceLawC--crimina
随机试题
WhenIfirstentereduniversity,myaunt,whoisanEnglishprofessor,gave
公路光纤数字传输系统几个重要的参数及定义。(1)系统接受光功率P1≥PR
某女,20岁。因高考落榜后,情志抑郁,经常喃喃自语,哭笑无常。此表现常见于(
房产分幅平面图上某房屋轮廓线中央注记为“1234”.则该房屋的层数为()。A.4
下列有关胰岛素制剂的描述不正确的是A.低精蛋白锌胰岛素是中效的 B.甘精胰岛素
中国的城市化进程进展到目前的阶段,已经从上一代人故土难离又难留的无奈抉择,转换成
针刺定喘、命门、昆仑穴,适宜的体位是( )。A.侧伏坐位 B.俯卧位 C.
图示药材为 A.木通 B.白芍 C.泽泻 D.羌活 E.白芷
水电厂布置返回屏时,应根据下列()准确条件决定。 A.清晰视矩不大于2.5m,
根据《建设工程质量管理条例》,下列关于施工机械设施安装单位的安全责任的说法正确的
最新回复
(
0
)