题目内容
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[单选题]
Putnam成本估算经验模型是( )。
A.模块性成本模型
B.结构性成本模型
C.动态单变量模型
D.动态多变量模型
提问人：网友anonymity
发布时间：2022-01-06
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A．静态单变量模型 B．静态多变量模型
C．动态单变量模型 D．动态多变量模型
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第7题
Rearrange the order of sentences for the abstract. 1）A random sample of freshman and sophomore students was invited to participate in an online survey on eating behaviors. Ordinary least squares regressions were fit to 148 complete responses to examine the association between family income ≤200% of the federal poverty level and overall, healthy, and unhealthy food consumption. 2）Disparities in diets for students from different socioeconomic backgrounds that were observed in the freshman year of college were absent in the sophomore year. Awareness of these disparities and trend is important to broadly promote healthy eating. 3）To investigate the existence and trajectory of diet disparities among college students from different socioeconomic statuses (SESs). 4）Low-SES students reported eating significantly more unhealthy food during their freshman year than their non−low-SES peers. This difference is not statistically significant for second-year students and robust to on-campus spending power. （格式示例：1-2-3-4）
