【单选题】Those who bring sunshine into the lives of others cannot keep ____ from themselves.
【简答题】某工厂对某产品的产量与单位成本的资料分析后有如下数据: 月 份 1 2 3 4 5 6 产量x千件 2 3 4 3 4 5 单位成本y元/件 73 72 71 73 69 68 (Ⅰ) 画出散点图,并判断产量与单位成本是否线性相关。 (Ⅱ) 求单位成本y与月产量x之间的线性回归方程。(其中已计算得: ,结果保留两位小数)
【简答题】某种产品的产量与单位在成本的资料如下: 产量(千件)x 单位成本(元/件)y 2 73 3 72 4 71 3 73 4 69 5 68 要求: (1)建立直线回归方程。 (2)指出产量每增加1000件时,单位成本平均下降了多少元? (3)假设产量为6000件时,单位成本为多少元?单位成本为70元时,产品应为多少件?
【单选题】在换热器中,间壁一侧的对流传热速率 = 推动力 / 阻力,其中推动力是指( )。
【简答题】某种产品的产量与单位在成本的资料如下: 产量(千件)x 单位成本(元/件)y 2 73 3 72 4 71 3 73 4 69 5 68 要求: (1)计算相关系数r,判断其相关程度。 (2)建立直线回归方程。 (3)指出产量每增加1000件时,单位成本平均下降了多少元?
【简答题】News Report 1. What inspired Mr. Lee to set up a translation company? A. The fact that he speaks more than six languages. B. The fact that some companies need translators. C. The fact that he once pro...
【单选题】重大和特别重大突发环境事件的调查处理应由()负责组织。
【简答题】If a free society cannot help the many who are poor,it cannot save the few who are rich.
【简答题】A.They cannot sit still or control their actions. B.They cannot talk fluently. C.They cannot study well. D.They cannot express their ideas well.