計(jì)算機(jī)專業(yè)英語第3章在線測試

1、計(jì)算機(jī)專業(yè)英語第13章在線測試剩余時間：59:53窗體頂端答題須知：1、本卷滿分20分。 2、答完題后，請一定要單擊下面的“交卷”按鈕交卷，否則無法記錄本試卷的成績。 3、在交卷之前，不要刷新本網(wǎng)頁，否則你的答題結(jié)果將會被清空。 第一題、單項(xiàng)選擇題（每題1分，5道題共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第二題、多項(xiàng)選擇題（每題2分，5道題共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第三題、判斷題（每題1分，5道題共5分）1、Computer security is a branch of technology known as information security as applied to computers.正確錯誤2、Michelangelo is a file sector.正確錯誤3、Computer virus is remote from us.正確錯誤4、Computer virus may affect the your phisical health .正確錯誤5、The author thinks that u