【单选题】某分公司采用回归线表示每月广告费用与每月产品销售量的关系(军用百万美元作单位),结果显示独立变量的回归系数为0.8.该系数是指:
B.
当每月广告费用处于平均水平时,产品销售额将是800,000美元
C.
一般而言, 每 增加1美元广告费,你将得到0.8美元的额外销售收入
D.
因为回归系数太小,所以广告费用不是销售额的很好预测因素
【单选题】图示的两种应力状态中 ,则只产生体积改变能密度的是( )。
【简答题】Why do people choose the different jobs that they did not think before? What are these jobs ?
【单选题】• 5 、下面不是恩格斯代表著作的是()。
C.
• 《路德维希·费尔巴哈和德国古典哲学的终结》
【简答题】U1-P15 Further Listening- Passage-1. Why do people express similar ideas in different ways?A. They know different languages B. They want to show off C. They are in different situations D. They want to...
【单选题】用适当的方法将被测组分与试样中的其他组分分离,然后转化为一定的称量形式的方法称为
【简答题】Word Bank: brainstorm, campaigns, commercials, electronic,databases, magazine, media mix, medium, PR, radio, Situation ysis, websites (Note: Two of the words above are interchangeable. But use eac...
【单选题】FURTHER LISTENING Listen to a passage and choose the best answer to each of the following questions. 1 Why do people express similar ideas in different ways? A . They want to show off. B . They are in...