TDC3000NCF组态内容有哪些？
参考答案：
1.单元组态2.区域组态3.操作台组态4.LCN节点组态5.系统通用数据组态6.HM卷组态
— Lucy looks very healthy. Do you know _____?
— At least half an hour.[ ]
A. how often she exercises.
B. how many vegetables she eats every day
C. how much milk she drinks every day
D. how long she exercises every day
描述变量数值分布的两个重要特征是（）
A.统计量与参数
B.样本均数与总体均数
C.集中趋势与离散趋势
D.样本标准差与总体标准差
E.样本与总体
