把一个长20厘米,宽10厘米的长方形纸剪成一个最大的圆,这个圆的周长是( )厘米,面积是( )平方厘米。
31.4;78.5
根据上下文内容,填入适当的单词。(每空一词)
I am from the USA. My name is Helen. I am Liu Tao's penfriend. Liu Tao is twelve years old. I'm as old as
him. There are four people in my family. My father is a doctor. My mother teaches English in a primary school.
My brother Jack is only four years old. He is lovely. We all love him very much.
Liu Tao a penfriend. name is Helen. She's an girl. There are people in
her family. Her father works in the , and her mother is a .
()是指根据企业过去几年的人员数量,分析出它在未来的变化趋势并依此来预测企业在未来某一时期的人力资源需求量。
A.回归分析法
B.趋势预测法
C.德尔菲法
D.比率预测法