什么叫析因实验设计?
参考答案:
析因实验设计是将每个处理因素的所有水平相互结合在一起,研究各处理因素间作用的一种实验设计方案。
He is the only one of the students who _____ a winner of scholarship for three years. [ ]
A. is
B. are
C. have been
D. has been
资金等值计算时的终值用字母()表示。
A.G
B.Z
C.F
D.P