由于软件具有可见性差、定量化难等特殊性，因此很难在项目完成前准确地估算出开发软件所需的工作量和费用。其中，估算源代码行数时，可以请n位有经验专家，每位专家对软件给出3个估计值：
·ai——最少源代码行数(该软件可能的最小规模)；
·bi——最大源代码行数(该软件可能的最大规模)；
·mi——最可能的代码行数(该软件最可能的规模)。
然后计算出每个专家的估算期望值Ei=（），n位专家的估算期望值的平均值
就是代码行数的估计值。
A.A
B.B
C.C
D.D
参考答案：C
解析：
这道题考查的是软件开发项目管理中的成本估算的基本知识，目的是考查考生对基础知识的掌握，是否全面、认真地阅读了软考教材，并且真正的理解和掌握。估算期望值[*]，这是项目管理(不仅仅是软件开发项目管理)中一个常见的公式。
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| Some people have very good memories and can easily learned quite long poems(诗歌) 1 _ heart. 2 people have poor memories and can only remember thingswhen they have said them 3 and over again. The famous English writer, Charles Dickens, said that he could walk down anylong street in 4 and then told you t'he name of all the shops he had 5 . Many great men of the world have wonderful memories. A good memory is 6 great help in learning a language. Everybody learns 7 0wn language by remembering what he hears when he was a small child. somechildren like those who live in foreign countries with their parents, seems to learn two.languages as 8 as they do one. In school, it is not so easy for people to learn 9 second language because they have very 10 time for it. | |||
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