[Process Engineering Division – Chemical Engineering Software Forum – Daily Question – Questions 02-08]
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【Process Engineering Section – Chemical Engineering Software Forum – Daily Question – Questions 02-08】Mechanical Drawing: If two lines are parallel, their three-dimensional projections must be ( )； When two lines intersect, their three-dimensional projections must be ( ), and the intersection point is the common point of the two lines ； Two lines that are neither parallel nor intersecting must ( ). Fill in the blanks: parallel, intersecting, crossing. CAD-related books are updated irregularly during the Spring Festival
Parallel, Intersecting, Neither Parallel nor Intersecting
If two lines are parallel, their three-dimensional projections must intersect； When two lines intersect, their three-dimensional projections must also intersect, and the point of intersection is the common point of the two lines ； Two lines that are neither parallel nor intersecting must (cross).