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机械图样必须依据一定的原理和规律才能画出和识读,“投影规律”则是图样绘制和识读的基本规律。因此要学好机械制图,掌握这一规律是其关键所在。
Mechanical drawings must be based on certain principles and laws in order to draw and read, “Projection ” is the basic law of drawing and reading. So to learn mechanical drawing, grasp the law is the key.