计算机专业英语第3章在线测试

1、计算机专业英语第13章在线测试剩余时间：59:53窗体顶端答题须知：1、本卷满分20分。 2、答完题后，请一定要单击下面的“交卷”按钮交卷，否则无法记录本试卷的成绩。 3、在交卷之前，不要刷新本网页，否则你的答题结果将会被清空。 第一题、单项选择题（每题1分，5道题共5分）1、Confidentiality of the message is not enough in a secure communication; is also needed. The receiver needs to be sure of the senders identity.A、encryptionB、autho

2、rizationC、authenticationD、encapsulation2、The data, when they are not encrypted, are called .A、plaintextB、ciphertextC、hypertextD、context3、A virus is a .A、beastB、computerC、bad manD、program4、Many viruses go resident in the memory like a ( ).A、.exe fileB、.com fileC、tsr programD、data file5、Now, about ( )

3、 different viruses account for all the viruses that actually spread in the wild.A、30B、150C、1800D、3000第二题、多项选择题（每题2分，5道题共10分）1、Viruses all have two phases to their eecution, the ( ) and the ( ).A、infection phaseB、delete phaseC、attack phaseD、creae phase2、( ) maybe a certain cause that some viruses inf

4、ect upon.A、a dayB、a timeC、an external event on your PCD、a counter within the virus3、Many viruses do harmful things such as ( ).A、deleting filesB、simulating typosC、slowing your PC downD、changing random data on your disk4、If a virus simply reproduce and have no cause for an attack phase, but it will s

5、till ( ) without your permission.A、stealing storageB、pilfer CPU cyclesC、delete filesD、play music5、Some viruses, with no attack phase, often damage the programs or disks they infect because they ( ).A、have bugs in themB、contain poor quality codeC、steal storageD、show messages on your screen第三题、判断题（每题1分，5道题共5分）1、Computer security is a branch of technology known as information security as applied to computers.正确错误2、Michelangelo is a file sector.正确错误3、Computer virus is remote from us.正确错误4、Computer virus may affect the your phisical health .正确错误5、The author thinks that u