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【多选题】
关于投资组合理论，以下说法正确的是（ ）。
A.
资产组合的收益率等于各个资产收益率的加权平均值，权重为单个资产总值与资产组合总值的比例
B.
资产组合的收益率方差等于各个资产的收益率方差的加权平均值，权重为单个资产总值与资产组合总值的比例
C.
当资产组合中不同资产的种类越多，资产组合的收益率方差就越多地由资产之间的协方差决定
D.
投资多元化能降低风险，是因为当资产种类增多时，单个资产的收益率方差对组合的收益率方差的影响逐渐减小
E.
投资者承担高风险必然会得到高的回报率，不然就没有人承担风险了
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