Resultado de búsqueda
Hace 10 horas · However, several places are still plagued by the problem of smog due to the stubble burning of lignocellulose in agricultural farms, and fossil fuel emissions pose a major threat due to carbon emissions, global warming, and the discharge of toxic gases. ... The starch peaks corresponding to the C–OH stretching and bending vibration band (weak ...
Hace 10 horas · The 1990s (often referred to as the "'90s" or "Nineties") was a decade that began on January 1, 1990, and ended on December 31, 1999. Known as the "post-Cold War decade", the 1990s are culturally imagined as the period between the Revolutions of 1989 and the September 11 attacks in 2001.The dissolution of the Soviet Union marked the end of Russia's status as a superpower, the end of a ...
Hace 10 horas · Mexiko-Stadt (spanisch Ciudad de México [sjuˈða(ð) ðe ˈmexiko], kurz: CDMX; bis 2016 México D.F.) ist die Hauptstadt der Vereinigten Mexikanischen Staaten.Sie gehört zu keinem Gliedstaat, sondern bildet eine eigene Gebietskörperschaft, in der 9,2 Millionen Menschen (2020) leben.Die Metropolregion Zona Metropolitana del Valle de México (ZMVM), zu der Mexiko-Stadt, angrenzende Regionen ...
Hace 10 horas · Pittsburgh (/ ˈ p ɪ t s b ɜːr ɡ / PITS-burg) is a city in and the county seat of Allegheny County, Pennsylvania, United States.It is the second-most populous city in Pennsylvania, after Philadelphia, and the 68th-most populous city in the U.S., with a population of 302,971 as of the 2020 census.The city is located in southwestern Pennsylvania at the confluence of the Allegheny River and ...
Hace 10 horas · 英语冠词用法系列讲座(十二)名词的帽子——冠. 冠词[guān cí]是英语中十分重要，意义色彩非常复杂的词；冠词是一种本身不能独立使用的虚词，一般放在名词前面，帮助说明这个名词的含义，是名词的帽子——冠；a[an]是不定冠词，the是定冠词，名词前面既没有冠词也没有其他限定词的现象是现代 ...
