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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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Can you offer us machine tools ___ the following specification？

To trade the people of all eoun tries the basis of equality and mutual ben efit is our established policy.

根据网络的覆盖范围以及网内计算机之间的距离，可以把网络分为局域125网和广域网（）

Gen erally we cover in sura nee __ defi nite （明确的） in structi ons from our clie nts.（）

A. i n abse nee of
B. in the abse nee of
C. in no abse nee of
D. in all abse nee of