比较两总体的平均数的代表性,标准差系数较小的总体,其平均数代表性亦小。()
代偿性呼吸性碱中毒可见
A. 血浆PH值正常,HCO3-下降,PCO2下降
B. 血浆PH值下降,HCO3-增高,PCO2下降
C. 血浆PH值正常,HCO3-下降,PCO2增高
D. 血浆PH值下降,HCO3-下降,PCO2下降
E. 血浆PH值正常,HCO3-增高,PCO2增高
按数量标志分组形成的分配分数列和按品质标志分组形成的分配数列都可以称为次数分布。()
The main idea of this passage is to______.
A. introduce the institutions in higher education
B. evaluate the institutions in higher education
C. clarify the institution terms in higher education
D. classify the institutions in higher education