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
