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The Chomsky hierarchy in the fields of formal language theory, computer science, and linguistics, is a containment hierarchy of classes of formal grammars. A formal grammar describes how to form strings from a language's vocabulary (or alphabet) that are valid according to the language's syntax. The linguist Noam Chomsky theorized that four ...
The fire triangle or combustion triangle is a simple model for understanding the necessary ingredients for most fires. [ 1] The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen ). [ 2] A fire naturally occurs when the elements are present and combined in the right mixture. [ 3]
A combustible material is a material that can burn (i.e., sustain a flame) in air under certain conditions. A material is flammable if it ignites easily at ambient temperatures. In other words, a combustible material ignites with some effort and a flammable material catches fire immediately on exposure to flame.
"The Flesch–Kincaid" (F–K) reading grade level was developed under contract to the U.S. Navy in 1975 by J. Peter Kincaid and his team. [1] Related U.S. Navy research directed by Kincaid delved into high-tech education (for example, the electronic authoring and delivery of technical information), [2] usefulness of the Flesch–Kincaid readability formula, [3] computer aids for editing tests ...
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Diesel-oil mud is typically mixed with up to 40% brine water. [57] Due to health, safety and environmental concerns, Diesel-oil mud is often replaced with vegetable, mineral, or synthetic food-grade oil-base drilling fluids, although diesel-oil mud is still in widespread use in certain regions. [58]
The cause of the fire was never officially determined. In 1962, a boy, who was a student at Our Lady of the Angels at the time of the fire, confessed to setting the blaze. At the time of the fire, he was 10 years old and in fifth grade. A family court judge later concluded the evidence was insufficient to substantiate the confession.
Grammatical tense. In grammar, tense is a category that expresses time reference. [ 1][ 2] Tenses are usually manifested by the use of specific forms of verbs, particularly in their conjugation patterns. The main tenses found in many languages include the past, present, and future. Some languages have only two distinct tenses, such as past and ...
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