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Auto-CadFor catia ebook video and tutorials just visit catia-begin.blogspot.com. Center Lines are used to represent symmetry. And to mark the centres of the circles and the axes of symmetrical parts, such as cylinders and bolts. Break Lines are freehand lines. Used to show where an object is broken to reveal interior features. Lines are used to indicates the sizes of features on a drawing. Section Lines are used in section views to represent surfaces of an objec. T cut by a cutting plane. In the current view.
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