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【单选题】
数据库系统运行在操作系统上,它与操作系统紧密相关,下列关于这种关系的描述中错误的是( )
A.
数据库系统具有自己的设备管理、进程管理、内存管理、存储管理、作业管理功能
B.
数据库的存储管理、内存管理等功能的实现都是基于底层操作系统的功能调用,和操作系统的各功能模块密切相关
C.
操作系统的任何硬件、软件失败,都可能影响数据库系统的正常运行
D.
对数据库系统的管理和维护,离不开操作系统的管理和维护
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【单选题】应用那种清洗剂清洗车身()当车身有沥青、焦油、鸟粪等污物时。
A.
二合一清洗剂
B.
脱蜡清洗剂
C.
专用清洗剂
【单选题】In what ways do children suffer from television?
A.
They become the victims of social violence
B.
They spend hours watching television instead of doing school work
C.
The programs make the children lose interest in the world
D.
The programs make the children spend too much of their parents’ money
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【单选题】What is this passage talking about?______
A.
How to be a good leader.
B.
Several ways to do business.
C.
How to be a successful net worker.
D.
How to keep in touch with people.
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A.
十溴联苯醚
B.
四溴双酚 A
C.
氢氧化铝
D.
红磷
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【单选题】According to the passage, what people need to do is to______.
A.
find ways to make future access to the material possible
B.
use more traditional material rather than digital one
C.
archive digital publications instead of paper ones in libraries
D.
preserve today's pervasive form. of communication, e-mails
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