6.8. Use the diagrams and the following table to classify the things described.
Classification
There are
|
two
three
several
many
|
types
kinds
sorts
classes
varieties
|
of materials
|
Materials
|
are of
fall into
|
|
We can
|
classify
divide
split
|
materials
|
into several
|
classes
categories
groups
types
|
according to…
|
Engineering materials
|
consist of
include
|
metals and non-metals
|
6.9. Match the symbols of chemical elements, their English names and their Russian equivalents. What are the properties of engineering materials containing these elements?
Fe tungsten [´tšŋstәn] алюминий
C titanium [taı´teıniәm] молибден
Cr tin [tın] вольфрам
W nickel [nıkl] марганец
Al molybdenum [mә´lıbdәnәm] кобальт
Cu manganese [´mæŋgә‚ni:z] углерод
Mn iron [´aıәn] железо
Ni copper [´kãpә] никель
Sn cobalt [´kә|‚bé:lt] олово
Co chromium [´krә|miәm] титан
Mo carbon [´kä:bәn] хром
Ti aluminium [‚ælә´mıniәm] медь
6.10. Join the pairs of sentences using however, therefore, because. Follow the models:
Model 1
Copper does not rust.
Copper corrodes.
(a + b) Copper does not rust; however it corrodes.
Model 2
Cast iron is a brittle metal.
Cast iron is not used to withstand impact loads.
(a + b) Cast iron is a brittle metal, therefore it is not used to withstand impact loads.
Model 3
Titanium is used for aircraft frames.
Titanium is light and strong.
(a + b) Titanium is used for aircraft frames because it is light and strong.
Chromium resists corrosion. Chromium is added to steels to make them rust-proof.
Manganese steel is very hard. Manganese steel is used for armour plate.
Bronze has a low coefficient of friction. Bronze is used to make bearings.
Nylon is used to make fibres and gears. Nylon is tough and has a low coefficient of friction.
Tin is used to coat other metals to protect them. Tin resists corrosion.
Tin is expensive. The coats of tin applied to other metals are very thin.
Stainless steels require little maintenance and have a high strength. Stainless steels are expensive and difficult to machine at high speeds.
Nickel, cobalt and chromium improve the properties of metals. Nickel, cobalt and chromium are added to steels.
6.11. Join the following sentences into one using the connectors in brackets. You may omit or replace any parts if that is necessary to retain the structure of an English sentence.
Model:
because/and/however
Plastics are used widely in engineering. They are cheap. They have resistance to atmospheric corrosion. Plastics are not particularly strong.
Plastics are used widely in engineering because they are cheap and have resistance to atmospheric corrosion; however, they are not particularly strong.
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