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Besides, if we have a close examination of the ______ reports, we may find that they are often divided into different parts or paragraphs on the ______, the test or experiment procedures, the observations, the findings or results and so on.

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This kind of knowledge also helps us in following the ______ developments in science.

六个基本视图之间的投影关系()、()、()。

为了合理利用图幅,国家标准允许将各基本视图自由配置,不按标准配置的基本视图为()。

将机件的部分结构向基本投影面投射,所得的视图为()。

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