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Christmas tree (oil well) Oil well Christmas tree. In petroleum and natural gas extraction, a Christmas tree, or tree, is an assembly of valves, casing spools, and fittings used to regulate the flow of pipes in an oil well, gas well, water injection well, water disposal well, gas injection well, condensate well, and other types of well.
Sample Ishikawa diagram shows the causes contributing to problem. The defect, or the problem to be solved, [1] is shown as the fish's head, facing to the right, with the causes extending to the left as fishbones; the ribs branch off the backbone for major causes, with sub-branches for root-causes, to as many levels as required.
A Chrismon tree is an evergreen tree often placed in the chancel or nave of a church during Advent and Christmastide. [1] [2] The Chrismon tree was first used by North American Lutherans in 1957, [3] although the practice has spread to other Christian denominations, [4] including Anglicans, [5] Catholics, [6] Methodists, [7] and the Reformed. [8]
Feeding the multitudes by Bernardo Strozzi, early 17th century. In Christianity, feeding the multitude comprises two separate miracles of Jesus, reported in the Gospels, in which Jesus used modest resources to feed thousands of followers who had gathered to see him heal the sick. The first miracle, the "Feeding of the 5,000", is the only ...
The 2012 National Christmas Tree on November 2, 2012, six days after it was planted. Sources of the National Christmas Tree in the United States have varied over time. The first National Christmas Tree was erected and lit by President Calvin Coolidge in 1923. As of 2011, the tradition has continued uninterrupted.
Christmas tree cultivation is an agricultural, forestry, and horticultural occupation which involves growing pine, spruce, and fir trees specifically for use as Christmas trees . The first Christmas tree farm was established in 1901, but most consumers continued to obtain their trees from forests until the 1930s and 1940s.
On December 26, 1875, Fyodor Dostoevsky and his daughter Aimée attended a children's ball and a Christmas tree held at the St. Petersburg Artists' Club. On December 27, Dostoevsky and Anatoly Koni arrived at the Colony for Juvenile Delinquents on the Okhta (outskirts of St. Petersburg at that time) headed by the famous teacher and writer Pavel Rovinsky.
Space complexity. Space. O (n) O (n) In computer science, a 2–3–4 tree (also called a 2–4 tree) is a self-balancing data structure that can be used to implement dictionaries. The numbers mean a tree where every node with children ( internal node) has either two, three, or four child nodes: a 2-node has one data element, and if internal ...