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2 天前 · The Mikoyan-Gurevich MiG-21 ( Russian: Микоян и Гуревич МиГ-21; NATO reporting name: Fishbed) is a supersonic jet fighter and interceptor aircraft, designed by the Mikoyan-Gurevich Design Bureau in the Soviet Union.
- 16 June 1955 (Ye-4)
- Chengdu J-7
- 1959–1985
2 天前 · The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake and sometimes referred to as a full-fledged sea. [2] [3] [4] An endorheic basin, it lies between Europe and Asia: east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern ...
- 211 m (690 ft)
- 371,000 km² (143,200 sq mi)
- 1,025 m (3,360 ft)
3 天前 · Childhood (1821–1836) Fyodor Dostoevsky, born on 11 November [ O.S. 30 October] 1821 in Moscow, was the second child of Dr. Mikhail Dostoevsky and Maria Dostoevskaya (born Nechayeva). He was raised in the family home in the grounds of the Mariinsky Hospital for the Poor, which was in a lower class district on the edges of Moscow. [13]
1 天前 · Pirates of the Caribbean is an American fantasy supernatural swashbuckler film series produced by Jerry Bruckheimer and based on Walt Disney's theme park attraction of the same name. The film series serves as a major component of the titular media franchise. Based on a fictionalized version of the Golden Age of Piracy (which is c. 1650–1726 ...
3 天前 · The uncertainty principle, also known as Heisenberg's indeterminacy principle, is a fundamental concept in quantum mechanics. It states that there is a limit to the precision with which certain pairs of physical properties, such as position and momentum, can be simultaneously known.
1 天前 · The ocean is the body of salt water that covers approx. 70.8% of Earth.[8] In English, the term ocean also refers to any of the large bodies of water into which the world ocean is conventionally divided.[9] The following names describe five different areas of the ocean: Pacific, Atlantic, Indian, Antarctic/Southern, and Arctic.[10][11] The ...
1 天前 · The history of scientific method considers changes in the methodology of scientific inquiry, as distinct from the history of science itself. The development of rules for scientific reasoning has not been straightforward; scientific method has been the subject of intense and recurring debate throughout the history of science, and eminent natural philosophers and scientists have argued for the ...
