计算机的用途不同,对其部件的性能指标要求也有所不同。以科学计算为主的计算机,对(1)要求较高,所以应该重点考虑(2)。空白(1)处应选择()
A. 外存储器的读写速度
B. 主机的运算速度
C. I/O设备的速度
D. 显示分辨率
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在微型计算机中,通常用主频来描述CPU的(1);对计算机磁盘工作影响最小的因素是(2)。空白(1)处应选择()
A. 运算速度
B. 可靠性
C. 可维护性
D. 可扩充性
对于二维数组a[1..6,1..8],设每个元素占两个存储单元,且以列为主序存储,则元素a[4,4]相对于数组空间起始地址的偏移量是()个存储单元。
A. 28
B. 42
C. 48
D. 54
(1)越高,屏幕上图像的闪烁感越小,图像越稳定,视觉效果也越好。当前PC中该指标大多采用(2)Hz。空白(2)处应选择()
A. 88
B. 75
C. 65
D. 55
共用题干题Whenthesystemuponwhichatransportentityisrunningfailsandsubsequentlyrestarts,the(21)informationofallactiveconnectionsislost.Theaffectedconnectionsbecomehalf-open,asthesidethatdidnotfaildoesnotyetrealizetheproblem.Thestillactivesideofahalf-openconnectionscanclosetheconnectionusinga(22)timer.Thistimermeasuresthetimethetransportmachinewillcontinuetoawaitan(23)ofatransmittedsegmentafterthesegmenthasbeenretransmittedthemaximumnumberoftimes.Whenthetimer(24),thetransportentityassumesthateithertheothertransportentityortheinterveningnetworkhasfailed.Asaresult,thetimerclosestheconnection,andsignalsanabnormalclosetotheTSuser.Intheeventthatatransportentityfailsandquicklyrestarts,half-openconnectionscanbeterminatedmorequicklybytheuseoftheRSTsegment,thefailedsidereturnsanRSTitoeverysegmentithatitreceives.WhentheRSTireachestheotherside,itmustbecheckedforvaliditybasedonthe(25)numberi,astheRSTcouldbeinresponsetoanoldsegment.Iftheresetisvalid,thetransportentityperformsanabnormaltermination.空白处(21)应选择()
A. data
B. state
C. signal
D. control