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PART I
Контрольная работа №5
Вариант 1
ЗаданиеI.
I. a). Without looking through the text, decide whether the
following statements are true or false.
1. Titanium is considered too brittle to be of any practical use.
2. Titanium alloys are very useful in mechanical engineering.
3. Titanium instruments corrode.
b). Read the text and write down the numbers of true
statements, using the vocabulary list.
Vocabulary list:
1. brittle(atr) хрупкий
2 impurity(n) примесь
3. artificial joints искусственные суставы
4. tensile strength прочность на разрыв
5. refractory(atr) огнеупорный
6. to surmount the barrier преодолеть барьер
7. pulp-and-paper industry целлюлозно-бумажная
промышленность
8. clamp(v) закреплять
9. straighten out(v) выпрямляться
10. tight spring тугая пружина
11. sensitive pickup чувствительный адаптер,
звукосниматель
A Wonder Metal
1. The story of titanium is extraordinary. To begin with, it was
discovered twice. A British scientist, William Gregor, found it
first and called it menachanite, and six years later, in 1797, M.
H. Claret, a German chemist, also found it and gave it its present
name.
2. For many years, titanium was of interest only to research
chemists - it was considered too brittle to be of any practical
value. Yet it was the impurities with which it was usually
associated (it forms compounds easily with nearly every known
element) that made it brittle.
3. It cost the chemists in many countries endless efforts to
isolate pure titanium and even more to start producing it
commercially. In 1948 the world stock of pure titanium was
only ten tons. Today the output is much larger.
4. Titanium has one surprising property - it is completely
inert in biological media, something the medical community
was quick to notice. It is being used to make artificial joints and
many other things necessary in surgery at the Priorov Central
Institute of Traumatology and Orthopedics. Titanium
instruments do not corrode, and are thirty per cent lighter than
instruments" made of stainless steel.
5. Titanium’s high standard of corrosion resistance, lightness,
tensile strength, and the ease of forging, rolling and stamping
are finding it more and more uses. Titanium alloys are very
useful in mechanical engineering, and for chemical and
refractory apparatus. Titanium helped Soviet design engineers
to surmount the sound and heat barriers in supersonic and
high-altitude aircraft designing. On earth, it shows good work at
chemical plants, in the pulp-and-paper and food industries.
Moreover, it is still a source of surprise for the investigator.
6. A group of researchers at our Institute, under the
leadership of Professor. I. Kornilov, D. Sc. (Chemistry),
produced a material that has a kind of "memory", as the
following experiment shows: a thin bent strip of the new alloy
was clamped to a stand, a 500-gram weight hung on the free
end. A current was passed through for several seconds, which
PART I discovered twice. A British scientist, William Gregor, found it
Контрольная работа №5 first and called it menachanite, and six years later, in 1797, M.
H. Claret, a German chemist, also found it and gave it its present
Вариант 1 name.
2. For many years, titanium was of interest only to research
ЗаданиеI. chemists - it was considered too brittle to be of any practical
I. a). Without looking through the text, decide whether the value. Yet it was the impurities with which it was usually
following statements are true or false. associated (it forms compounds easily with nearly every known
element) that made it brittle.
1. Titanium is considered too brittle to be of any practical use. 3. It cost the chemists in many countries endless efforts to
2. Titanium alloys are very useful in mechanical engineering. isolate pure titanium and even more to start producing it
3. Titanium instruments corrode. commercially. In 1948 the world stock of pure titanium was
only ten tons. Today the output is much larger.
b). Read the text and write down the numbers of true 4. Titanium has one surprising property - it is completely
statements, using the vocabulary list. inert in biological media, something the medical community
was quick to notice. It is being used to make artificial joints and
Vocabulary list: many other things necessary in surgery at the Priorov Central
Institute of Traumatology and Orthopedics. Titanium
1. brittle(atr) хрупкий instruments do not corrode, and are thirty per cent lighter than
2 impurity(n) примесь instruments" made of stainless steel.
3. artificial joints искусственные суставы 5. Titanium’s high standard of corrosion resistance, lightness,
4. tensile strength прочность на разрыв tensile strength, and the ease of forging, rolling and stamping
5. refractory(atr) огнеупорный are finding it more and more uses. Titanium alloys are very
6. to surmount the barrier преодолеть барьер useful in mechanical engineering, and for chemical and
7. pulp-and-paper industry целлюлозно-бумажная refractory apparatus. Titanium helped Soviet design engineers
промышленность to surmount the sound and heat barriers in supersonic and
8. clamp(v) закреплять high-altitude aircraft designing. On earth, it shows good work at
9. straighten out(v) выпрямляться chemical plants, in the pulp-and-paper and food industries.
10. tight spring тугая пружина Moreover, it is still a source of surprise for the investigator.
11. sensitive pickup чувствительный адаптер, 6. A group of researchers at our Institute, under the
звукосниматель leadership of Professor. I. Kornilov, D. Sc. (Chemistry),
produced a material that has a kind of "memory", as the
A Wonder Metal following experiment shows: a thin bent strip of the new alloy
was clamped to a stand, a 500-gram weight hung on the free
1. The story of titanium is extraordinary. To begin with, it was end. A current was passed through for several seconds, which
