效用可以用数值来衡量,并且能够加总,这种效用评价方式是。( )
A. 基数效用论
B. 偶数效用论
C. 序数效用论
D. 差异效用论
sometimes the meaning of the passage is impied.you should know the habit.
A. 对
B. 错
how to know the paragraph. it is divided in three part: introduce,body,conclusion
A. 对
B. 错
请同学们回答一下自己的专业在哪些地方需要采集并分析数据,有什么用途?