两样本均数的比较可采用()
A．t检验
B．方差齐性检验
C．方差分析与t检验均可
D．方差分析
E．方差齐性检验与t检验均可
参考答案：C
My brother and I _____ at school from Monday to Friday.[ ]
A. have lunchs
B. have a lunch
C. have lunch
D. have the lunch
聚氨酯橡胶
