【单选题】关于频率直方图的下列有关说法正确的是( )
B.
直方图的高表示该组上的个体在样本中出现的频率
C.
直方图的高表示取某组上的个体在样本中出现的频数与组距的比值
D.
直方图的高表示取该组上的个体在样本中出现的频率与组距的比值
【判断题】The ears forgive the noise because the noise realizes his fault. ( )
【简答题】常见的滚动轴承一般由: 、 、 和 组成。
【单选题】有如下SQL语句: SELECT DISTINCT productName, price FROM product WHERE (price>(SELECT AVG(price) FROM product)) ORDER BY price DESC; 下面说法错误的是( )。
A.
"SELECT AVG(price) FROM product "是子查询
B.
"ORDER BY price DESC"是指按price从低到高顺序排列
D.
此查询显示的字段只有"productName"和"price"
【单选题】关于频率分布直方图中的有关数据,下列说法正确的是( )
A.
直方图的高表示该组上的个体在样本中出现的频率与组距的比值
B.
直方图的高表示该组上的个体在样本中出现的频率
【单选题】If product fails, the customers will probably select another product and may become ______ angry at the manufacturer that they never purchase another of their products.
【简答题】After determining the target audience for a product or service, advertising agencies must select the appropriate media for the advertisement. We discuss here major types of media used in advertising. ...