进行方差分析的资料应满足的前提条件是()
A.各样本是相互独立的随机样本
B.各样本均服从正态分布
C.各样本的总体方差相等
D.样本含量较大
E.ABC均是
参考答案:E
—Would you mind _______ my pet dog when I am out?
—Sorry, I can't. I have to study for my test this week. [ ]
A. take cave of
B. taking care of
C. to take care of
D. taking care
测量实际制冷系统压缩机吸气口温度的目的是为了帮助决定运行工况图上的过()。