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Not only does the central engine of active galaxies and quasars require a black hole, but also to provide the radiative energy.
Trade Restrictions
Trade restrictions are government-imposed limitations on the international exchange of goods and services, such as tariffs, quotas, embargoes, or standards.
Import Tariff
A tax levied by a nation on goods imported into the country.
Balance of Trade
The difference in value between a country's imports and exports over a certain period, indicating its trading position with the rest of the world.
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