将受试对象按一定条件配成对子,再随机分配每对中的两个受试对象到不同处理组,这种设计称为
A.配对设计B.随机区组设计C.完全随机设计D.单纯随机抽样E.系统抽样
参考答案:A
He had a strong desire _____ his parents, but it turned out that the result was far from _____. [ ]
A. to satisfy; satisfactory
B. satisfying; satisfaction
C. to satisfy; satisfied
D. to be satisfied with; satisfaction
下列哪种蚜虫不是为害小麦的主要种类()。
A.麦二叉蚜
B.麦长管蚜
C.稻缢管蚜
D.桃蚜