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  1. 3 天前 · The president of the United States is the head of state and head of government of the United States, [1] indirectly elected to a four-year term via the Electoral College. [2] The officeholder leads the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces. [3]

  2. en.wikipedia.org › wiki › TitaniumTitanium - Wikipedia

    4 天前 · Titanium is used in steel as an alloying element (ferro-titanium) to reduce grain size and as a deoxidizer, and in stainless steel to reduce carbon content. [9] Titanium is often alloyed with aluminium (to refine grain size), vanadium, copper (to harden), iron, manganese, molybdenum, and other metals. [92]

  3. 2 天前 · Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO2, commonly found in nature as quartz. [5][6] In many parts of the world, silica is the major constituent of sand. Silica is one of the most complex and abundant families of materials, existing as a compound of several minerals and as a synthetic product.

  4. en.wikipedia.org › wiki › InternetInternet - Wikipedia

    2 天前 · e. The Internet (or internet) [a] is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) [b] to communicate between networks and devices. It is a network of networks that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of ...

  5. 5 天前 · ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard [1] published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest.

  6. en.wikipedia.org › wiki › PhilosophyPhilosophy - Wikipedia

    1 天前 · Philosophy ('love of wisdom' in Ancient Greek) is a systematic study of general and fundamental questions concerning topics like existence, reason, knowledge, value, mind, and language. It is a rational and critical inquiry that reflects on its own methods and assumptions.

  7. 1 天前 · Sheikh Hasina Wazed[a] (born 28 September 1947) is a Bangladeshi politician who served as the tenth prime minister of Bangladesh from June 1996 to July 2001 and again from January 2009 to August 2024. [3][4] She is the daughter of Sheikh Mujibur Rahman, the founding father and first president of Bangladesh.

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