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Aluminum (sulfate or sulfate) - a brief description of the use

Steel - an indispensable material

Granite screenings - design and building material

American tractors "John Deere" are working in the fields all over the world

How to choose the right fastener?

Universal ship invisible - corvette "Guarding"

What is the next largest passenger aircraft in the world?

The tanks 'Leopard' claim to world leadership

The fastest tank BT-7 was not created for the defense

Respiratory system: valves NDKM

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Environmental factor - it's ... ecology and people.Types of environmental factors.Classification of environmental factors
Noise pollution.
What is being done to protect the air in the city?