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已知二次函数f（x）=ax 2 +bx，且f（x+1）为偶函数，定义：满足f（x）=x的实数x称为函数f（x）的“不动点”，若函数f（x）有且仅有一个不动点， （1）求f（x）的解析式； （2）若函数g（x）=f（x）+ k x + 1 2 x 2 在 （0， 6 3 ]上是单调减函数，求实数k的取值范围； （3）在（2）的条件下，是否存在区间[m，n]（m＜n），使得f（x）在区间[m，n]上的值域为[km，kn]？若存在，请求出区间[m，n]；若不存在，请说明理由．
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【单选题】Which statement about portfolio diversification is correct?______.
A.
Proper diversification can reduce or eliminate systematic risk.
B.
As more securities are added to a portfolio, total risk typically would be expected to fall at a decreasing rate.
C.
The risk-reducing benefits of diversification do not occur meaningfully until at least 30 individual securities are included in the portfolio.
D.
Diversification reduces the portfolio's expected return because it reduces a portfolio's total risk.
【简答题】分散化(diversification)
【简答题】分散化原则(diversification principle)
【单选题】When a company combines with firms in different and dissimilar industries, it indulges in ________. A) unrelated diversification B) vertical integration C) stabilized diversification D) horizontal int...
A.
unrelated diversification
B.
vertical integration
C.
stabilized diversification
D.
horizontal integration
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