Which type of line is used to represent the boundaries or limits of an imaginary or non-physical feature in an engineering drawing?
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Boundaries or limits of imaginary or non-physical features in an engineering drawing are represented by thin phantom lines. Phantom lines are drawn with long dashes alternating with pairs of short dashes. They are used to depict features that are not physically present but are important for understanding the design or construction of the object. Phantom lines help to visualize hidden or alternate positions, as well as dimensions and clearances.