1. Английский язык
  2. 1. When were the first

1. When were the first synthetic materials made? 2. How may the chemical fibres be subdivided? 3. What are rayons? 4. Why are synthetic fibres considered to be true man-made fibres? 5. Is it possible to order the necessary length or even properties of synthetic fibres? 6. What are the main advantages and disadvantages of synthetics? 7. What are the main uses of man-made fibres? 8. What synthetic fabrics do you know? ​

katywwka katywwka    2   28.10.2020 09:40    2

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