标准差、方差和变异系数主要用来反映().
A.计量资料的集中趋势
B.计数资料的集中趋势
C.计量资料的离散趋势
D.计数资料的离散趋势
E.分类资料的离散趋势
参考答案:C
---__________?
---Yes, please.
A.What would you like
B.What does he look like
C.Would you like some apple juice
D.What does he like
为了减小(),节约钢材,简化布置,多采用()的下降管。