[Solved] Although the First Amendment of the Constitution guarantees freedom of speech, this freedom is restricted in speeches that A) advocate changing the law of the land. B) oppose the current political power. C) present a clear and present danger. D) include pornographic material. Datum Feature: An exact point, axis, or plane upon which dimensions are based or measurements are taken in technical drawings. Surface Plate: A flat, rigid plate used as a reference plane for precision inspection, marking, and layout of materials in machining and quality control operations. Primary Datum: A reference point, axis, or plane from which dimensions are measured or a baseline for the construction of geometric features in drawings. Geometric Tolerances: The limits of allowable variation in the shape and size of a part's geometry, including its form, orientation, and location, specified in engineering drawings.