The church tower which      will be open to tourists soon. The work is almost finished.

A．has restored

B．has been restored

C．is restoring

D．is being restored

要全面描述正态分布或近似正态分布资料的分布特征，可采用（）

A.均数与标准差

B.中位数与四分位数间距

C.全距与中位数

D.均数与变异系数

E.以上均不对