Task 2. find the grammar form that contains the mistake. write it down correctly. 1. she have read the book i advised her to take. 2. when do you usually began sunbathing ? 3. we have heard a lot of interesting thing on the radio lately. 4. i had to stay at home yesterday as i have very much work to do. 5. led doesn’t know what the time [snow as my watch had stopped. 6. suddenly i remembered that i have promised my friend to return his english text-book. 7. if he_is still working when you come back, advises him to go to bed. 8. all the student knew what they had to revise for the examinations. a b c 9. boris says he has visited many beautiful place along the black sea. 10. the man you want to speak to come back tomorrow.
1) The properties of building and materials are classified into four groups: physical, mechanical, chemical, technological, etc.
2) Resistance to salt aggression and other chemicals (wood)
An important advantage of natural stone is strength, durability, resistance to environmental influences, frost resistance (stone)
Strength; reliability; versatility; combination with other materials (metal)
3) All metals are divided into two groups: ferrous and non-ferrous
4) Ferrous metals and alloys contain iron, non-ferrous metals do not. Ferrous metals are mild steel, carbon steel, stainless steel, cast iron and wrought iron. ... Since they do not contain iron, non-ferrous metals have a higher resistance to corrosion and rust.
Объяснение: just decided