马克维茨描述资产组合理论主要着眼于()。
A.系统风险的减少
B.分散化对资产组合风险的影响
C.非系统风险的确认
D.积极的资产管理以扩大收益
参考答案:B
----Who ______the computer? I want to use it.
----Timmy. He ______ it for a week.
A.borrowed, has borrowed
B.has borrowed, bought
C.has borrowed, has kept
D.bought, has borrowed
论述内燃机压缩比的意义