含乙炔基的药物()
A.己烯雌酚
B.醋酸甲地孕酮
C.达那唑
D.醋酸氟轻松
E.醋酸泼尼松龙
参考答案:C
There __________ great changes in our city in the past 10 years.[ ]
A. were
B. had
C. have been
D. have had
在成组设计方差分析中,检验假设是
A.各样本均数相等B.各总体标准差相等C.各样本方差相等D.各总体均数相等E.各总体方差相等