--What is that building?

--____________ the students have their dance classes.

A．The building that

B．There are

C．That’s the building which

D．That’s where

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