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22 小時前 · Hydrogen gas is produced by several industrial methods. Nearly all of the world's current supply of hydrogen is created from fossil fuels. [1] [2] : 1 Most hydrogen is gray hydrogen made through steam methane reforming. In this process, hydrogen is produced from a chemical reaction between steam and methane, the main component of natural gas.
22 小時前 · Depleted uranium ( DU; also referred to in the past as Q-metal, depletalloy or D-38) is uranium with a lower content of the fissile isotope 235 U than natural uranium. [2] Natural uranium contains about 0.72% 235 U, while the DU used by the U.S. Department of Defense contains 0.3% 235 U or less. The less radioactive and non-fissile 238 U ...
22 小時前 · The McDonnell Douglas F/A-18 Hornet is an all-weather supersonic, twin-engine, carrier -capable, multirole combat aircraft, designed as both a fighter and attack aircraft (hence the F/A designation ). Designed by McDonnell Douglas and Northrop, the F/A-18 was derived from the latter's YF-17 in the 1970s for use by the United States Navy and ...
22 小時前 · Ammonia is a colourless gas with a characteristically pungent smell.It is lighter than air, its density being 0.589 times that of air.It is easily liquefied due to the strong hydrogen bonding between molecules. Gaseous ammonia turns to a colourless liquid, which boils at −33.1 C (−27.58 F), and freezes to colourless crystals [21] at −77.7 C (−107.86 F).
22 小時前 · Sulfur dioxide is the product of the burning of sulfur or of burning materials that contain sulfur: 1⁄8 S8 + O2 → SO2, ΔH = −297 kJ/mol. To aid combustion, liquified sulfur (140–150 °C, 284-302 °F) is sprayed through an atomizing nozzle to generate fine drops of sulfur with a large surface area.
22 小時前 · Mikhail Sergeyevich Gorbachev [f] [g] (2 March 1931 – 30 August 2022) was a Soviet and Russian politician who served as the last leader of the Soviet Union from 1985 to the country's dissolution in 1991. He served as General Secretary of the Communist Party of the Soviet Union from 1985 and additionally as head of state beginning in 1988, as Chairman of the Presidium of the Supreme Soviet ...
22 小時前 · Service number. 179215. Sir Edward Richard George Heath KG MBE (9 July 1916 – 17 July 2005), commonly known as Ted Heath, was a British politician who served as Prime Minister of the United Kingdom from 1970 to 1974 and Leader of the Conservative Party from 1965 to 1975. Heath also served for 51 years as a Member of Parliament from 1950 to 2001.
