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The airspace class designation is in effect only during the hours of tower and approach operation at the primary airport; the airspace reverts to Class D if approach control is not operating, and to class E or G if the tower is closed. The vertical boundary is usually 4,000 feet (1,200 m) above the airport surface.
List of Dewey Decimal classes. The Dewey Decimal Classification (DDC) is structured around ten main classes covering the entire world of knowledge; each main class is further structured into ten hierarchical divisions, each having ten divisions of increasing specificity. [1] As a system of library classification the DDC is "arranged by ...
Creola Katherine Johnson ( née Coleman; August 26, 1918 – February 24, 2020) was an American mathematician whose calculations of orbital mechanics as a NASA employee were critical to the success of the first and subsequent U.S. crewed spaceflights. [1] [2] During her 33-year career at NASA and its predecessor, she earned a reputation for ...
Private Use Areas. In Unicode, a Private Use Area ( PUA) is a range of code points that, by definition, will not be assigned characters by the Unicode Consortium. [1] Three private use areas are defined: one in the Basic Multilingual Plane ( U+E000–U+F8FF ), and one each in, and nearly covering, planes 15 and 16 ( U+F0000–U+FFFFD, U+100000 ...
Falcon 9 is a partially reusable medium-lift launch vehicle that can carry cargo and crew into Earth orbit, [A] designed, manufactured and launched by American aerospace company SpaceX. It can also be used as an expendable heavy-lift launch vehicle. [B] The first Falcon 9 launch was on 4 June 2010.
Class 3: Flammable Liquids. A flammable liquid is a liquid having a flash point of not more than 60 °C (140 °F), or any material in a liquid phase with a flash point at or above 37.8 °C (100 °F) that is intentionally heated and offered for transportation or transported at or above its flash point in a bulk packaging.
A-1 Buildings intended for the production and viewing of performing arts or motion pictures (theaters, concert halls). A-2 Buildings intended for food and/or drink consumption (restaurants). A-3 Buildings intended for worship, recreation or amusement and other assembly uses not otherwise classified. A-4 Buildings intended for viewing of indoor ...
The section sign ( §) is a typographical character for referencing individually numbered sections of a document; it is frequently used when citing sections of a legal code. [1] It is also known as the section symbol, section mark, double-s, or silcrow. [2] [3] In other languages it may be called the "paragraph symbol" (for example, German ...