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【单选题】
关于操作系统,下面的话错误的是:A.
操作系统其实就是一种应用软件
B.
操作系统的服务对象,可以是“人”,也可以是正在运行的程序。
C.
操作系统的一个功能就是管理计算机硬件,高效运转。
D.
由于打印机是无法共享的外部设备,如果两个用户同时申请打印机打印文档,由操作系统负责协调这个冲突。
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举一反三
【单选题】Which is the most compelling reason why mobile advertising is related to big data?
A.
Mobile advertising benefits from data integration with location which requires big data.
B.
Mobile advertising allows massive cellular/mobile texting to a wide audience, thus providing large amounts of data.
C.
Mobile advertising in and of itself is always associated with big data.
D.
Since almost everyone owns a cell/mobile phone, the mobile advertising market is large and thus requires big data to contain all the information.
【简答题】某社区的宣传栏安排了我国2009年~2010年发生的以下事情:四川汶川地震一周年纪念、西南旱灾、青海玉树地震、建国60周年国庆阅兵、上海世博会、广州亚运会、纪念改革开放30周年。请你为这期宣传栏写一则“前言”。要求:紧扣内容,富有文采。
【单选题】Based on the result of those case-crossover studies, while driving, using a handsfree cellular device is _______ using a hand held cell phone,
A.
as safe as
B.
not safer than
C.
hard to tell which is safer
D.
safer than
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【简答题】用列举法表示下列集合: (1) 方程 的根的集合; (2) 抛物线 与直线 的交点的集合 .
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