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1 天前 · It is also the world’s highest, driest, windiest, coldest, and iciest continent. Antarctica is about 5.5 million square miles (14.2 million square km) in size, and thick ice covers about 98 percent of the land. The continent is divided into East Antarctica (which is largely composed of a high ice-covered plateau) and West Antarctica (which is ...
2024年5月8日 · covalent bond, in chemistry, the interatomic linkage that results from the sharing of an electron pair between two atoms. The binding arises from the electrostatic attraction of their nuclei for the same electrons. A covalent bond forms when the bonded atoms have a lower total energy than that of widely separated atoms.
2 天前 · The Renaissance was a period in European civilization that immediately followed the Middle Ages and reached its height in the 15th century. It is conventionally held to have been characterized by a surge of interest in Classical scholarship and values. The Renaissance also witnessed the discovery and exploration of new continents and numerous important inventions.
1 天前 · The United States is the fourth largest country in the world in area (after Russia, Canada, and China ). The national capital is Washington, which is coextensive with the District of Columbia, the federal capital region created in 1790. United States. The major characteristic of the United States is probably its great variety.
2024年5月23日 · Cambodia. Siĕmréab. Angkor. Angkor Wat, temple complex at Angkor, near Siem Reap, Cambodia, that was built in the 12th century by King Suryavarman II (reigned 1113–c. 1150) of the Khmer empire. The vast religious complex of Angkor Wat comprises more than a thousand buildings, and it is one of the great cultural wonders of the world.
2024年5月13日 · information system, an integrated set of components for collecting, storing, and processing data and for providing information, knowledge, and digital products. Business firms and other organizations rely on information systems to carry out and manage their operations, interact with their customers and suppliers, and compete in the marketplace.
2024年4月19日 · Red kangaroo (Macropus rufus) jumping. The red kangaroo is found throughout Australia’s interior grasslands and is the largest and most powerful macropodid. An old male may attain a head and body length of 1.5 metres (5 feet), have a tail 1 metre (3.3 feet) long, and stand 2 metres (6.6 feet) tall.
