属于吲哚乙酸类的为
A.吲哚美辛B.阿司匹林C.吡罗西康D.保泰松E.布洛芬
参考答案:A
The book has been well received, but _________ actual sales, it hasn’t been very successful.
A.in terms of
B.in need of
C.in favour of
D.in honor of
无效假设应是
A.样本均数与总体均数相同
B.样本来自差数为零的总体
C.两样本差别有显著性
D.两样本抽样误差不相同
E.两样本标准误相同