Putnam成本估算模型是一个( )模型。
A.静态单变量
B.动态单变量
C.静态多变量
D.动态多变量
A.静态单变量
B.动态单变量
C.静态多变量
D.动态多变量
A、The first united and centralized feudal monarchy was established.
B、The war forced China to seclude itself from the outside world.
C、Wu Zetian became the only female empress in Chinese history.
D、China opened its door to the world during and after the war.
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)
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