研究人员从工作方便出发,在调查对象中随意选择一定数量的个体进行问卷,这种抽样是( ) A prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> A. 任意非随机抽样 B. 判断非随机抽样 C. 配额非随机抽样 D. 整群非随机抽样
【单选题】We are scattered now, the friends of the late Mr. Oliver Offord but whenever we chance to meet I think we are conscious of a certain esoteric respect for each other. 'Yes, you too have been in Arcadia...