指标用于描述总体的特征,而标志用于描述总体单位的特征。因此,描述样本的特征可以用指标,也可以用标志。
参考答案:错
有“硅谷”之称的电子工业中心位于( )
A.休斯敦附近
B.芝加哥附近
C.洛杉矶附近
D.圣弗朗西斯科附近
I didn’t get up earlier as usual last Sunday. In the morning having finished my homework, I do some washing.Then I telephoned one of my classmates and invited them to see a film.But unfortunately, when we got to the cinema, we founded all the tickets had sold out.We had to go back to school or play football.After that, we were about to go to home when we saw our English teacher, Mr.Li, coming towards us.Tom and I asked him some questions about what to learn English well.He told us we had made great progresses in English.He also suggested that we read more and write more.We promised him that we would follow our advice