台湾地区自古以来就是我国领土，在中国古代文献里被称为“蓬莱”、“贷舆”、“瀛洲”、“

会计账户按提供指标的（）分类，可以分为总分类账户和明细分类账户。

A.结构

B.会计科目

C.流动性

D.详细程度

With respect to determining the optimal portfolio for an investor, which of the following statements is most accurate（）

A. Two investors may choose the same optimal portfolio even if their indifferent curve are different.

B. Less risk-averse investors will have steeper utility curves than more riskaverse investors.

C. The optimal portfolio lies at the point of tangency between the efficient frontier and indifference curve with the highest possible utility.

血液的生理功能( )

A．运输功能
B．协调功能
C．维护机体内环境
D．防御功能
E．以上都是

简述数据模型的抽象过程

公元（）年，李自成率领农民起义军攻占北京。