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内湿与哪脏功能失常关系密切()

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A．SMTPB．IPC．EDIFACTD．HDLCE．ARP

A. SMTP
B. IP
C. EDIFACT
D. HDLC
E. ARP

标准离差率是一个相对指标，可以用来比较预期收益率不同的资产之间的风险大小。 ()

A. 正确
B. 错误

An expert system is a software that(41)specialist knowledge-about a particular domain of(42)and is capable of making(43)decisions with in that domain. Although expert systems typically focus on a very narrow domain, they have achieved dramatic success with(44)problems, This has excited wide spread interest outside the research laboratories from which they emerged.Expert systems have given rise to a set of "knowledge engineering" methods constituting a new approach to design of high performance software system. This new approach represents an(45)change with revolutionary consequences.

A. develops
B. directory
C. effect
D. encapsulates
E. evolutionary

要求你从语气、词序、语法结构等方面对有关语句作出判断。
第 21 题下列各句中，没有语病，句意明确的一句是（）。