- 选择样本的基本要求有：明确规定______________、取样的随机性、取样的代表性和合理的______________。
- We shall certai nly con tact you, as soon as we are ____ a positi on to en terta in new bus in ess in your district.
- 取样的基本方法主要包括简单随机抽样、______________和______________等。
- Please make sure that the stipulations in the L/C are ______ exact accorda nee ___ the terms of the Sales Con tract.
- 理论构思一般应包括准确地表述______________、界定该研究课题的______________、形成初步的______________等内容。
- 理论构思是指以一定科学理论为指导，在已有的客观现实材料及理论研究成果基础上运用科学的思维方式对所要研究问题的现象、过程、本质或原因的一种______________。理论构思反映研究者对研究问题______________的理解所达到精确性、完备性和深刻性的程度。
- To trade ____ the people of all eoun tries ____ the basis of equality and mutual ben efit is our established policy.
- 常用的教育文献检索工具书主要有：书目，_______________，_______________，字典、词典，类书、政书，百科全书，年鉴、手册，表谱、图录等。
- Can you offer us machine tools ___ the following specification?
- 教育文献的主要分布(即教育文献情报源)包括：书籍、_________________、教育档案类、专家询问和_________________等方面。
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