AC is a type of current flow in a circuit. Electric charge in alternating current (AC), changes direction periodically. The voltage in AC circuits also periodically reverses because the current changes direction. It transmits electricity over long distances. AC can come in a number of forms, as long as the voltage and current are alternating.
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The Answer is two
The building of highly functional multi-story buildings
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The Indus civilization was between 25000 BCE to 1700 BCE. Lasting from 3300 BCE to 1300BCE, Indus civilization also called the Indus valley civilization was an ancient civilization located in what is today called Pakistan and some part of INDIA. It is the earliest know urban culture of the Indian subcontinent at the bronze Age, South Asia. At it peak, the Indus valley has a population of about five million people. Some called it the Harappa civilization. Large cities of Mohenjo-daro and Harappa were built in the area
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The factors that led to the Berlin Blockade were a combination of economic and ideological conflicts. On the one hand, the existing and growing rivalry between the Soviet Union and the democratic allies (America, Britain and France) in ideological terms, with the rivalry between communism and capitalism, fueled a constant state of tension and dispute between the two Germanies. To this was added the recent monetary reform carried out in West Berlin, which accompanied the adoption of the Mark in West Germany. This currency was much stronger than the East German currency, so the Soviet authorities feared that it might produce a kind of de facto economic control by the West over East Germany.
These factors made the Soviet authorities decide to close its borders with West Germany, practically closing West Berlin and economically isolating it from the rest of the world, in an event that is known as the Berlin Blockade.
they are political china agreed with each country on where the borders would lie
