3. Fill in the word from the list:

Provided, fast, consumption, discovered, vacuum tube, development, electronic circuits, increased, reduced, transistor, appeared, semiconductor.

The transistor invented by American scientists W.Shockly, J. Bardeen and W.Brattain in 1948 completely replaced the (1). The transistor, a small piece of a (2) with three electrodes, had great advantages over the best vacuum tubes. It (3) the same functions as the vacuum tube but at (4) weight, cost, power (5), and with high reliability. With the invention of the (6) all essential circuit functions could be carried out inside solid bodies. The aim of creating (7) with entirely solid-state components had finally been realized. Early transistors could respond at a rate of a few million times a second. This was (8) enough to serve in radio circuits, but far below the speed needed for high speed computers or for microwave communication systems.

The progress in semiconductor technology led to the (9) of the integrated circuit (IC), which was (10) due to the efforts of John Kilby in 1958. There (11) a new field of science — integrated electronics. IC greatly reduced the size of devices, lowered manufacturing costs and at the same time they provided high speed and (12) reliability.

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Ответы на вопрос:

4,7(69 оценок)

1.when i came home, my little sister was sleeping.

2. when nick came home, his brother was playing with his toys.

3. when mother came home, i was doing my homework.

4. when father came home, pete was sleeping.

5. when mother came home, the children were playing on the carpet.

6. when i got up, my mother and father were drinking tea.

7. when i came my friend's place, he was watching tv.

8. when i saw my friends, they were playing football.

9. when i opened the door, the cat was sitting on the table.

10. when kate opened the door, the children were dancing round the fir-tree.

11. when tom was crossing the street, he fell.

12. when i was going to school, i met my friend.

13. when we were going to the cinema, we met grandmother.

14. when grandmother was going home, she saw many children in the yard.

15. when henry was walking about in the forest, he found a bear cub.

16. when we were walking about in the forest, we saw a hare.

17. when i was washing the floor, i found my old toy under the sofa.

18. when granny was reading a book on the sofa, she fell asleep.

19. when i was playing in the yard, i suddenly saw my old friend.

20. when nick was running about in the yard, he fell.

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