下列指标中,描述抽样误差大小的指是
A.变异系数
B.标准差
C.标准误
D.极差
E.四分位数间距
参考答案:C
—What do you think of the NBA basketball match last night?
--It was__,I really enjoyed it.
A.boring
B.wonderful
C.strange
D.terrible
模仿虎、鹿、熊、猿、鸟五种禽兽的活动姿态,编成一套医学体操的是[ ]
A.张仲景
B.华佗
C.李时珍
D.张衡