反映均数抽样误差大小的指标是
A.标准误
B.自由度
C.变异系数
D.均数
E.全距
参考答案:A
提高存款准备金率对货币供求的影响是()。
A.增加货币需求
B.减少货币需求
C.增加货币供给
D.减少货币供给
After supper she would sit down by the fire,sometimes for _____ an hour,thinking of her young and happy days.
A.as long as
B.as soon as
C.as much as
D.as many as