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1) Ago, long, machine-tools, existed

10-11 класс

2) invention, a, not, machine-tool, new, a, is, today

3) Today, are, different, the, machines, from, of, those, of the past

4) Be, different, in future, machine-tools, will

5) The, do, workers, what, will?

NickSpa 29 окт. 2013 г., 14:55:16 (10 лет назад)
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Sanlinedecor
29 окт. 2013 г., 17:08:11 (10 лет назад)

1. Machine-tools existed long ago.
2. A machine-tool is not a new invention today.
3. The machines of today are different from those of the past.
4. Machine-tools will be different in future.
5. What will the workers do?

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Novocherkassk
lies at the confluence of
the Tuzlov and the Aksay
rivers. The original 16th-
century town of
Starocherkasskaya stood
along the Don River, but
it was frequently flooded
and was moved to the
present site
Novocherkassk long
served as the capital of
the Don Cossack region
and was a center of
opposition in 1917-20
during the Russian Civil War.
Novocherkassk is
a unique town owing to
its history and
architecture. It was built
as the capital of the
Cossacks in 1805 by the
General Platov, the
famous Ataman Matvei
Platov who led his
Cossack regiments
against Napoleon. Novocherkassk was designer by The
French architect Devolan
designed Novocherkassk.
Don Cossacks called it
«Small Paris» for its
layout, wide streets and
squares.
Novocherkassk is
famous for its
architectural
monuments; almost each
old building has its own
features. There is a
magnificent Cathedral in
the center of the town. It
is the third in Russia in
size and beauty. Next to
the cathedral there is a
monument to Yermak,
the gallant conqueror of
Siberia. The monument
to the famous General
Platov has been recently
restored. There were
numerous churches in
the past, but a lot of
them were destroyed
after the October
Revolution. Nowadays
some of them have been
rebuilt. In
Novocherkassk there are
several museums, among
them the Grekov
Museum, the Krylov
Museum and the most
well-known the Museum
of the Don Cossacks
History.
In the second
part of the twentieth century
Novocherkassk became
an industrial town.
Many
plants and industrial
enterprises were built
here , among them the only in
Russia electro-locomotive
plant, chemical and
machine-building plants
and many others. Modern Novocherkassk
produces electric
locomotives, mining
machinery, machine
tools, and chemicals for
plastics and synthetic
fibres.
There is a
thermal power station
too.
Novocherkassk is
a very green and nice
town; there are many
parks and gardens in it.
It is called the town of
students. The city has
numerous institutions of
higher education and
research. There is a
theatre and some
cinemas. Its population is about 200 000 people. In 1993 Novocherkassk became the capital of the Cossacks on the decision
of the Russian and
foreign Cossacks again.

1.Where does Novocherkassk lie?
2.Why was Starocherkasskaya moved from its original place?
3.What capital was Novocherkassk before the revolution?
4.When was Novocherkassk founded?
5.What do you know about Matvei Platov?
6.Who designer Novocherkassk?
7.What is Novocherkassk famous for?
8.What museums are there in Novocherkassk?
9.When did Novocherkassk become an industrial town?
10.Why is Novocherkassk called the town of students?
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Metals are materials most widely used in industry because of their properties. The study of the production and properties of metals is known as metallurgy.

The separation between the atoms in metals is small, so most metals are dense. The atoms are arranged regularly and can slide over each other. That is why metals are malleable (can be deformed and bent without fracture) and ductile (can be drawn into wire). Metals vary greatly in their properties. For example, lead is soft and can be bent by hand, while iron can only be worked by hammering at red heat.

The regular arrangement of atoms in metals gives them a crystalline structure. Irregular crystals are called grains. The properties of the metals depend on the size, shape, orientation, and composition of these grains. In general, a metal with small grains will be harder and stronger than one with coarse grains.

Heat treatment such as quenching, tempering, or annealing controls the nature of the grains and their size in the metal. Small amounts of other metals (less than 1 per cent) are often added to a pure metal. This is called alloying (легирование) and it changes the grain structure and properties of metals.

All metals can be formed by drawing, rolling, hammering and extrusion, but some require hot-working. Metals are subject to metal fatigue and to creep (the slow increase in length under stress) causing deformation and failure. Both effects are taken into account by engineers when designing, for example, airplanes, gas-turbines, and pressure vessels for high-temperature chemical processes. Metals can be worked using machine-tools such as lathe, milling machine, shaper and grinder.

The ways of working a metal depend on its properties. Many metals can be melted and cast in moulds, but special conditions are required for metals that react with air.



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