影响样本容量确定的因素。
参考答案:
(1)总体的规模。
(2)推断的把握性与精确性。
(3)总体的异质性程度。
(4)研究者所拥有的经费、人力和时间。
7. Although there is a difference in spelling and pronunciation between American English and British English, both of the countries have much to _______.
A.communicate
B.change
C.share
D.Improve
广域网的英文缩写是______,局域网的英文缩写是______。