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зб рник текст в для сам работи дневник

1. Find the correct headings of the paragraphs.

1. The main characteristics of concrete.

2. The chief principles of plastics classification.

3. Factors that influence mass production of prefabricated large-size concrete and reinforced-concrete structural elements.

4. New tendencies in the choice of building materials.

5. The advantages of reinforced concrete.