Post-and-lintel system
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Post-and-lintel system, in building construction, a system in which two upright members, the posts, hold up a third member, the lintel, laid horizontally across their top surfaces. All structural openings have evolved from this system, which is seen in pure form only in colonnades and in framed structures, because the posts of doors, windows, ceilings, and roofs normally form part of the wall.
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It's the first one, a vanishing road to show perspective because you can see the lines of the fence seem to go one forever into the distance.
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Altificial silk, is made from natural cellulose derived from wood pulp or cotton rags
A. Selecting a topic; considering presentation aids
