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1 天前 · Ozone (/ˈoʊzoʊn/) (or trioxygen) is an inorganic molecule with the chemical formula O 3. It is a pale blue gas with a distinctively pungent smell. It is an allotrope of oxygen that is much less stable than the diatomic allotrope O 2, breaking down in the lower atmosphere to O 2 (dioxygen). Ozone is formed from dioxygen by the action of ...
1 天前 · The 45th Canadian federal election will take place on or before October 20, 2025, to elect members of the House of Commons to the 45th Canadian Parliament.The date of the vote is determined by the fixed-date provisions of the Canada Elections Act, which requires federal elections to be held on the third Monday in October in the fourth calendar year after the polling day of the previous ...
2 天前 · Batman[a] is a superhero appearing in American comic books published by DC Comics. The character was created by artist Bob Kane and writer Bill Finger, and debuted in the 27th issue of the comic book Detective Comics on March 30, 1939. In the DC Universe continuity, Batman is the alias of Bruce Wayne, a wealthy American playboy, philanthropist ...
2 天前 · History (derived from Ancient Greek ἱστορία (historía) 'inquiry; knowledge acquired by investigation') [1] is the systematic study and documentation of the human past. [2] [3] The period of events before the invention of writing systems is considered prehistory. [4] ". History" is an umbrella term comprising past events as well as the ...
3 天前 · 7-Eleven, Inc.[2] is an American convenience store chain, headquartered in Irving, Texas and owned by Japanese company Seven & I Holdings through Seven-Eleven Japan Co., Ltd.[3] The chain was founded in 1927 as an ice house storefront in Dallas. It was named Tote'm Stores between 1928 and 1946. After Ito-Yokado, a Japanese supermarket chain ...
3 天前 · Silicon Valley is a region in Northern California that is a global center for high technology and innovation. Located in the southern part of the San Francisco Bay Area, it corresponds roughly to the geographical area of the Santa Clara Valley. [1] [2] [3] The term "Silicon Valley" refers to the area in which high-tech business has proliferated ...
2 天前 · Time zones of the world A time zone is an area which observes a uniform standard time for legal, commercial and social purposes. Time zones tend to follow the boundaries between countries and their subdivisions instead of strictly following longitude, because it is convenient for areas in frequent communication to keep the same time. ...
