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A commercial driver's license is required to operate a tractor-trailer for commercial use. A commercial driver's license (CDL) is a driver's license required in the United States to operate large and heavy vehicles (including trucks, buses, and trailers) or a vehicle of any size that transports hazardous materials or more than 15 passengers (including the driver).
A common property-carrying commercial vehicle in the United States is the tractor-trailer, also known as an "18-wheeler" or "semi".. The trucking industry serves the American economy by transporting large quantities of raw materials, works in process, and finished goods over land—typically from manufacturing plants to retail distribution centers.
In the late 1950s, the American Association of State Highway and Transportation Officials (AASHTO) conducted a series of extensive field tests of roads and bridges to determine how traffic contributed to the deterioration of pavement materials. In 1964, the AASHTO recommended to Congress that a bridge formula table be used instead of a single ...
Conventional style cab tractor A cab-over semi-tractor Tractor with an end-dump trailer A FAW semi-trailer truck in China A semi-trailer truck (also known by a wide variety of other terms – see below) is the combination of a tractor unit and one or more semi-trailers to carry freight. A semi-trailer attaches to the tractor with a type of hitch called a fifth wheel. Other terms There are a ...
Liberal Democratic Centre (CDL, Spanish: Centro Democrático Liberal), a former political party in Spain China Democratic League , a social liberal political party in China Chung Dahm Learning , is an English language institute in South Korea
An encyclopedia is a repository of general knowledge. General knowledge is information that has been accumulated over time through various media and sources. [1] It excludes specialized learning that can only be obtained with extensive training and information confined to a single medium. General knowledge is an essential component of ...
In knowledge representation and reasoning, a knowledge graph is a knowledge base that uses a graph-structured data model or topology to represent and operate on data. Knowledge graphs are often used to store interlinked descriptions of entities – objects, events, situations or abstract concepts – while also encoding the free-form semantics ...
Moreover, (x, y, z) is a primitive Pythagorean triple if both of the following conditions are verified: [14] if x is odd then d is a square and { d , x 2 / d } are coprime odd integers, and if x is even then d /2 is a square and { d /2, x 2 /2 d } are coprime integers of different parities.
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