第6题: [单项选择]已知某商品流通企业第15个周期时,采用二次移动平均数法,取a15=47,b15=3,则预测第20周期的销售量为(
)吨。 A. 50 B. 62 C. 141 D. 44 参考答案:B 答案解析: [解析]
二次移动平均数法预测公式为:Yt+T=at+btT。第20周期的销售量为:Y20=47+3
第34题: [单项选择]The author believes that more houses were bought last year because ______. A. the economic recession was less serious B. many people earned more before C. the interest rate was very low D. real-estate developers lowered their prices 参考答案:C 答案解析:事实细节题。在最后一段谈论房产市场好转的原因时,作者说low mortgage rates offset the impact of the recession,所以说贷款利率低是主要原因。