51● （63） 是软件系统测试的典型输入。① 合同书 ② 需求规格说明书 ③ 程序代码 ④ 系统设计说明书
A.①和②
B.①、②和③
C.①和③
D.①、②、③和④
开始考试练习点击查看答案52● 系统分析模型应明确体现的因素是 （64） 。① 性能描述 ② 功能描述 ③ 约束条件 ④ 系统结构 ⑤ 动态模型。
A.①、②、③、④和⑤
B.①、②、③和⑤
C.①、②和④
D.①、②、④和⑤
开始考试练习点击查看答案53● 嵌入式系统软硬件协同设计从目标系统构思开始，经过（65）阶段完成。①需求描述 ② 软硬件划分 ③ 硬件综合、接口综合、软件编译④软硬件集成 ⑤ 软硬件协同仿真与验证
A.①、②、③、④和⑤
B.②、③、④和⑤
C.②、④和⑤
D.①、②、④和⑤
开始考试练习点击查看答案54● NAC’s（Network Access Control） role is to restrict network access to onlycompliant endpoints and （66） users. However, NAC is not a complete LAN （67）solution; additional proactive and （68） security measures must be implemented.Nevis is the first and only comprehensive LAN security solution that combines deepsecurity processing of every packet at 10Gbps, ensuring a high level of securityplus application availability and performance. Nevis integrates NAC as the firstline of LAN security （69） . In addition to NAC, enterprises need to implementrole-based network access control as well as critical proactive security measures—real-time, multilevel （70）inspection and microsecond threat containment.
A.automated
B.distinguished
C.authenticated
D.destructed
开始考试练习点击查看答案55● Virtualization is an approach to IT that pools and shares （71） so thatutilization is optimized and supplies automatically meet demand. Traditional ITenvironments are often silos, where both technology and human 72）are aligned aroundan application or business function. With a virtualized （73） , people, processes,and technology are focused on meeting service levels, （ 74 ） is allocateddynamically, resources are optimized, and the entire infrastructure is simplifiedand flexible. We offer a broad spectrum of virtualization 75） that allows customersto choose the most appropriate path and optimization focus for their ITinfrastructure resources.
A.advantages
B.resources
C.benefits
D.precedents
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