—______ he said at the meeting made everyone present angry.

—Yes.We all ______ him of his rudeness.

A．That；accused

B．What；accused

C．That；charged

D．/；charged

均数的标准误是衡量（）。

A.变量值之间的变异

B.正态曲线下面积

C.样本均数之间的变异

D.均数与某一标准指标之间的差值

E.标准正态分布