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  2. OpenDocument technical specification - Wikipedia

    en.wikipedia.org/wiki/OpenDocument_technical...

    To indicate which version of the OpenDocument specification a file complies with, all root elements take an office:version attribute (in the format revision.version, such as office:version="1.1"), which identifies the version of ODF specification that defined the associated element, its schema, its complete content, and its interpretation.

  3. Engineering drawing abbreviations and symbols - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing...

    1. Center line, the central axis of a feature. 2. Class, for example, "paint per spec XYZ revision C type 1 class 2" may be abbreviated as "paint per spec XYZ REV C TY 1 CL 2" or even in some cases "paint per spec XYZ-C-1-2". (The latter practice is not uncommon but is cryptic for workers with minimal training and experience. The first two ...

  4. Block Elements - Wikipedia

    en.wikipedia.org/wiki/Block_Elements

    The glyphs in Block Elements each share the same character width in most supported fonts, allowing them to be used graphically in row and column arrangements. However, the block does not contain a space character of its own and ASCII space may or may not render at the same width as Block Elements glyphs, as those characters are intended to be ...

  5. Khrushchevka - Wikipedia

    en.wikipedia.org/wiki/Khrushchevka

    Panel khrushchevka in Tomsk. Khrushchevkas (Russian: хрущёвка, romanized: khrushchyovka, IPA: [xrʊˈɕːɵfkə]) are a type of low-cost, concrete-paneled or brick three- to five-storied apartment buildings (and apartments in these buildings) which were designed and constructed in the Soviet Union since the early 1960s (when their namesake, Nikita Khrushchev, was leader of the Soviet ...

  6. Surface area - Wikipedia

    en.wikipedia.org/wiki/Surface_area

    A sphere of radius r has surface area 4πr 2.. The surface area (symbol A) of a solid object is a measure of the total area that the surface of the object occupies. [1] The mathematical definition of surface area in the presence of curved surfaces is considerably more involved than the definition of arc length of one-dimensional curves, or of the surface area for polyhedra (i.e., objects with ...

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  8. Specific surface area - Wikipedia

    en.wikipedia.org/wiki/Specific_surface_area

    Specific surface area (SSA) is a property of solids defined as the total surface area (SA) of a material per unit mass, [1] (with units of m 2 /kg or m 2 /g). Alternatively, it may be defined as SA per solid or bulk volume [ 2 ] [ 3 ] (units of m 2 /m 3 or m −1 ).

  9. Flatness (manufacturing) - Wikipedia

    en.wikipedia.org/wiki/Flatness_(manufacturing)

    By testing all three in pairs against each other, it is ensured that the surfaces become flat. Using two surfaces would result in a concave surface and a convex surface. Eventually a point is reached when many points of contact are visible within each square inch, at which time the three surfaces are uniformly flat to a very close tolerance.