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    How much do you know about Technical Drawing?

    In the dihedral system, what is an edge plane?

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    A plane parallel to the ground line.
    A plane perpendicular to a projection plane.Correct
    A plane oblique to all projection planes.
    A horizontal plane.

    An edge (or projecting) plane is one that is perpendicular to one of the projection planes, so its projection on that plane is a straight line.

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