题目内容
_______是将多个实体组合成一个整体，并给这个整体命名保存，在以后的图形编辑中这个整体就被视为一个实体。
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CAD中图块分为_______和_______两类。其中，_______只能在本图形文件中使用。
图块可以多级嵌套。但嵌套块不能与其内部嵌套的图块同名。（）
请简述理想与现实的辩证统一关系。
Directions: You are going to read a passage with 10 statements attached to it. Each statement contains information given in one of the paragraphs. Identify the paragraph from which the information is derived. You may choose a paragraph more than once. Each paragraph is marked with a letter.Reading literature makes us smarter and nicer
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