Английский язык. Громовая И.И - 22 стр.

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СПб ГУАП | Санкт-Петербург

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20
12. Перепишите и переведите приводимые ниже предложения. По-
ставьте их в отрицательную форму. Задайте общий и специальный воп-
росы к каждому предложению.
1. The Wilsons normally have breakfast at 7 o’clock. (When?) 2. Many people like
to work in the garden. (Where?) 3. They went to the airport by car. (How?) 4. They
chose books and magazines at the bookstall. (What?) 5. I shall know the result in a
week. (When?) 6. He will buy a present to Mary for Christmas. (To whom?)
13. Прочтите и устно переведите текст. Перепишите и письменно
переведите 2-й абзац текста.
Junction Transistors
The junction transistor
1
was one of the first types of transistor to come into
commercial use, and many thousands are now used in electronic circuits. The
junction transistor is a bipolar transistor, that is it employs both p-types and n-types
semiconductor regions.
Early transistors were made from germanium, and were mainly of the p-n-p
type. That is, they comprise a single crystal, which contains two p-regions and one
n-region. One of the p-regions, known as an emitter, is of low resistivity material
with a heavy impurity doping. The emitter is the source of charge carriers in the
transistor. The central n-region is known as the base region of the transistor, and is
a relatively pure
2
semiconductor of high resistivity. The base region is the control
electrode or control region of the transistor. The second p-region, known as the
collector region, has a lower conductivity than the emitter region, and is the region
in which the mobile charge carriers are finally collected.
With the development of silicon devices, p-n-p transistors have come into
more common usage. In the n-p-n transistor, the two extreme n-regions are
the emitter and collector, respectively, while the central p-region is the base
region.
NOTES:
1
junction transistor –плоскостной транзистор
2
pure – чистый, без примесей
Вариант 3
1. Вставьте в предложения глагол to be в форме единственного или
множественного числа is/are.
1. Our furniture … getting old. 2. All my belongings … in my bag. 3. Physics
… a compulsory subject at school. 4. Her jeans … black. 5. Billiards … played all
over the world.

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