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已知关系模式R,U={A,B,C,D,E},F={AB->C,C->D,D->E},R的一个分解为R1(A,B,C),R2(C,D,E)。则该分解是()。()
A.无损分解但不保持函数依赖
B.保持函数依赖但不是无损分解
C.不保持函数依赖且不是无损分解
D.保持函数依赖且是无损分解
A.无损分解但不保持函数依赖
B.保持函数依赖但不是无损分解
C.不保持函数依赖且不是无损分解
D.保持函数依赖且是无损分解
()A.A类地址、B类地址、C类地址
B.单播地址、组播地址、任意播地址
C.单播地址、组播地址、广播地址
D.公共地址、站点地址、接口地址
()A.积极投资 B.稳健投资 C.保守投资 D.不投资
A.篡改管理信息:通过改变传输中的SNMP报文实施未经授权的管理操作
B.通信分析:第三者分析管理实体之间的通信规律,从而获取管理信息
C.假冒合法用户:未经授权的用户冒充授权用户,企图实施管理操作
D.消息泄露:SNMP引擎之间交换的信息被第三者偷听
Most large enterprises have a network of homegrown, legacy mainframe, and packaged applications that need to share information and (71 ) . Unfortunately, most of these systems are proprietary to the vendor, and were written in different programming languages with different data structures. Integration (72 ) was developed to allow (73 ) systems to communicate. Enterprise Application Integration (EAI) is used to integrate applications inside the (74 ) . B2B integration extends integration beyond the enterprise to customers, partners, and suppliers. The emerging Web Services (75 ) goes even further by defining a single set of standards for integration both inside and outside the enterprise. As a result, vendors in EAI and B2B markets will be profoundly affected by Web Services.
(71)
A. network
B. computers
C. data
D. functionality
A.篡改管理信息:通过改变传输中的SNMP报文实施未经授权的管理操作
B.通信分析:第三者分析管理实体之间的通信规律,从而获取管理信息
C.假冒合法用户:未经授权的用户冒充授权用户,企图实施管理操作
D.消息泄露:SNMP引擎之间交换的信息被第三者偷听
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