Science

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Conditions of occurrence, consequences, causes of explosions and fires
Fires and explosions: definition. the most dangerous construction sites. Conditions for the occurrence of fires, explosions, consequences of an emergency
› Dolls of the USSR. Soviet children's toys
› Soviet power. Establishment of Soviet power
› Tsar Alexei Mikhailovich Romanov
› Grand Duke Konstantin Nikolaevich: biography
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› The purpose of the study is Theme, object, subject, tasks and purpose of the study
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Hydrogen bond: examples and types of chemical bonds
If you look at the chronology of the study in chemical science of the ability of atoms of various elements to interact with each other, we can single out the middle of the 19th century. At that time, scientists drew attention to the fact that hydrogen compounds of oxygen, fluorine, nitrogen are characterized by a group of properties that can be called anomalous
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› Barrel in liters: how many barrels in one liter
› Import - what does it mean? The meaning of the word "import"
› Who is the great helmsman?
› Marshal Konev: biography, photo, personal life, family
› Soviet state: date of creation, historical events, chronology and political system
› Rulers of the USSR in chronological order

Felix Edmundovich Dzerzhinsky - statements about the Chekists, about Russia. "Only a person with a cold head, a warm heart and clean hands can be a Chekist"
Dzerzhinsky becomes a member of the Moscow Committee of the RSDLP after the February Revolution of 1917. Here he is engaged in propaganda of an armed uprising. Lenin assesses the personal qualities of Dzerzhinsky and includes him in the military revolutionary center. F. E. Dzerzhinsky - one of the organizers of the October armed coup
› Flag of the Soviet Navy. Soviet navy
› What is a nautical mile and what is the sea knot?
› Bosphorus - a strait at the junction of the continents
› Explosive gas - good or bad? Composition, formula, application
› Bosom friend - how to understand? Origin and meaning
› Fusion reactors in the world. First fusion reactor
› Combustion product: classification, types, description