1. Columbus discovered America.
America was discovered by Columbus.
2. We keep money in a safe.
Our money is kept in a safe.
3. A bee stung her.
She was strung by a bee.
4. They speak Italian in Italy.
Italian is spoken in Italy.
5. They have taken his aunt to hospital.
His aunt has been taken to hospital by them.
6. The boys damaged the television.
The television was damaged by the boys.
7. Da Vinci painted the Mona Lisa.
The Mona Lisa was painted by Da Vinci.
8. He invited 30 people to his party.
30 people were invited by him to his party.
9. They grow bananas in Africa.
Bananas is grown in Africa.
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
Объяснение:
As I don't often listen to the radio or read advertisements in magazines, I usually get to know about new products from the Internet and also from my friends.
When I meet them at weekends, we chat about modern devices, appliances or household products. If I am interested in that information, I start asking different questions.
A cheap price can persuade me buy a product, if I need it.