C++本身没有定义I/O操作,但I/0操作包含在C++实现中。C++标准库iostr

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问题:

C++本身没有定义I/O操作,但I/0操作包含在C++实现中。C++标准库iostream提供了基本的I/O类。I/O操作分别由类istream和工______提供。

考点:计算机等级考试C++二级C++笔试
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下列句子中有语病的一项是( )

A.现在,全国有100多个城市提出要建设“低碳城市”,其中一个很重要的内容就是提倡绿色出行。

B.新版《中华人民共和国全图》左下角还有一幅放大的钓鱼岛插图,较详细地表示了钓鱼岛及其附属岛屿与祖国大陆及台湾岛的位置。

C.对于公民发表监督意见而言,网络身份管理将会使人们以更负责任的态度发表言论、实行监督。

D.以人为本是体育转型的核心理念,要充分重视并开掘体育所蕴含的教育功能和独特价值,使之真正成为促进人的全面发展的有效手段。

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以下说法错误的是(  )

A.两直线平行,内错角相等

B.三角形的最大内角不小于60度

C.同位角相等,两直线平行

D.两边和他们一边的对角对应相等的两个三角形全等

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下列指标中,用于衡量信息系统稳定运行水平和能力的是

A.安全性

B.可靠性

C.可扩展性

D.适应性

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监理在设计阶段常选用的质量控制措施不包括______。

A.组织设计交底会
B.审查关键部位测试方案
C.协助建设单位制定项目质量目标规划
D.协助建设单位提出工程需求方案,确定工程的整体质量目标

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A small group of Internet security specialists gathered in Singapore to start up a global system to make e-mail and e-commerce more secure, end the rapid growth of passwords and raise the bar significantly for Internet fraud, spies and troublemakers.

The Singapore event included an elaborate technical ceremony to create and then securely store numerical keys that will be kept in three hardened data centers there, in Zurich and in San Jose, Calif. The keys and data centers are working parts of a technology known as Secure DNS, or DNSSEC. DNS refers to the Domain Name System, which is a directory that connects names to numerical Internet addresses. Preliminary work on the security system had been going on for more than a year, but this was the first time the system went into operation, even though it is not quite complete.

The three centers are fortresses made up of five layers of physical, electronic and cryptographic security, making it virtually impossible to damage the system. Four layers are active now. The fifth, a physical barrier, is being built inside the data center.

The technology is viewed by many computer security specialists as a ray of hope amid the recent cascade of data thefts, attacks, disruptions and scandals, including break-ins at Citibank, Sony, Lockheed Martin, RSA Security and elsewhere. It allows users to communicate via the Internet with high confidence that the identity of the person or organization they are communicating with is not being tricked or forged.

Internet engineers like Dan Kaminsky, an independent network security researcher who is one of the engineers involved in the project, want to counteract three major deficiencies in today’s Internet. There is no mechanism for ensuring trust, the quality of software is uneven, and it is difficult to track down bad actors.

One reason for these flaws is that from the 1960s through the 1980s the engineers who designed the network’s underlying technology were concerned about reliable, rather than secure, communications. That is starting to change with the introduction of Secure DNS by governments and other organizations.

The event in Singapore capped a process that began more than a year ago and is expected to be complete after 300 so-called top-level domains have been digitally signed. Before the Singapore event, 70 countries had adopted the technology, and 14 more were added as part of the event. While large countries are generally doing the technical work to include their own domains in the system, the association of Internet security specialists is helping smaller countries and organizations with the process.

It is suggested in Paragraph 4 that()

A. the Net security system has protected lots of companies from data thefts

B. scientists sees the Net Security System as a promising technology

C. companies like Sony are undergoing an Internet security crisis

D. communication via the Internet makes people more confident

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