Thecommandecho$!willproducewhatoutput?()
A. theprocessidoflastbackgroundcommand
B. theexitstatusofthelastcommand
C. theexitstatusofthelastbackgroundcommand
D. theprocessidofthecurrentshell
E. thenameofthecommandbeingexecuted
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引题的作用是()。
A. 揭示意义
B. 交代背景
C. 烘托气氛
D. 引出主题
WhichofthefollowingistheLEASTintrusivewayofcheckingtheenvironmentforknownsoftwareflaws?()
A. Protocolanalyzer
B. Vulnerabilityscanner
C. Portscanner
D. Penetrationtest
新闻背景往往是新闻事实出现的()。
A. 人物
B. 缘由
C. 环境
D. 主客观条件
WhichtypeofserverisresponsibleforresolvingNetBIOSnames?()
A. mailserver
B. DNSserver
C. webserver
D. WINSserver
E. DHCPserver