1) Density is measured in kilograms per cubic meter.
2) Most materials have a higher density than water and sink in water.
3) The density of the material is very important, especially in aviation.
4) Young's modulus is the ratio of the applied force to the elastic deformation of a given material.
5) The more rigid the metal, the less it deforms under load.
6) when the metal is stretched, it first flows, that is, it is plastically deformed.
7) Lead, copper, aluminum and gold are the most malleable metals.
8) Creep resistance is a very important property of materials used in aircraft engines.
Объяснение:
Henry doesn't play tennis every day.
I am talking to them now.
She isn't eating sweets now.
My friend doesn't like to play football.
I am not reading now.
Is he sleeping now?
We don't go to the county in winter.
My sister eats sweets every day.
They do their homework in the afternoon.
They don't go for a walk in the evening.
My father doesn't work on Sunday.
I don't read books in the morning.
I'm not writing a letter now.
They aren't playing in the street now.
Are they playing in the room now?
Does he help his mother every day?
Do you go to school on Sunday?
Is she working in a shop now?
Is he delivering letters now?
Do you go to opera with your friends?
He is never late.
We all like the sea.
Look! Kate is dancing.
Where does Alex live?He lives in England.
Where are they going now?
