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1 天前 · Gross domestic product (GDP) is the market value of all final goods and services from a nation in a given year. [2] . Countries are sorted by nominal GDP estimates from financial and statistical institutions, which are calculated at market or government official exchange rates.
1 天前 · The United States of America ( USA or U.S.A. ), commonly known as the United States ( US or U.S.) or America, is a country primarily located in North America. It is a federation of 50 states, a federal capital district ( Washington, D.C. ), and 326 Indian reservations.
1 天前 · Bill Gates. William Henry Gates III (born October 28, 1955) is an American businessman, investor, philanthropist, and writer best known for co-founding the software giant Microsoft, along with his childhood friend Paul Allen. During his career at Microsoft, Gates held the positions of chairman, chief executive officer (CEO), president, and ...
1 天前 · AIM-9 Sidewinder. The AIM-9 Sidewinder ("AIM" for "Air Intercept Missile") is a short-range air-to-air missile. Entering service with the United States Navy in 1956 and the Air Force in 1964, the AIM-9 is one of the oldest, cheapest, and most successful air-to-air missiles. [3] Its latest variants remain standard equipment in most Western ...
1 天前 · Adolf Hitler [a] (20 April 1889 – 30 April 1945) was an Austrian-born German politician who was the dictator of Nazi Germany from 1933 until his suicide in 1945. He rose to power as the leader of the Nazi Party, [c] becoming the chancellor in 1933 and then taking the title of Führer und Reichskanzler in 1934.
2 天前 · Schizophrenia is a mental disorder [17] characterized by reoccurring episodes of psychosis that are correlated with a general misperception of reality. [7] Other common signs include hallucinations (typically hearing voices ), delusions (i.e., paranoia ), disorganized thinking and behavior, [10] social withdrawal, and flat or inappropriate ...
2 天前 · Probability theory. In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is. The parameter is the mean or expectation of the distribution (and also its median and mode ), while ...
