评定精度的标准，通常用（）表示。
A、平均误差
B、容许误差
C、均方误差
D、中误差
参考答案：A, B, D
As they are retired,Mr and Mrs Scott prefer a house in the country to spend their later years to______in a large city.
A.it B.that C.one D.which
反映宏观经济运行的关键变量包括（），分别通过不同指标加以衡量。
A.产出
B.就业
C.价格
D.收入
E.税收
r years to______in a large city.
.one D.which