Прочитайте текст и заполните пропуски подходящими по смыслу словами Electronics surrounds us everywh...: ответ на тест 284238 - Английский язык

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Electronics surrounds us everywhere. Television, tape-recording, radio-receiving - electronics is at the heart of them all. But that is only a small part of 1_______________ and not the most important at that. Extremely complicated electronic systems 2______________ the work of huge plants, enterprises and 3_______________ stations. Electronic appliances are indispensable for planning and controlling our national 4_______________.

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Electronics surrounds us everywhere. Television, tape-recording, radio-receiving - electronics is at the heart of them all. But that is only a small part of 1_______________ and not the most important at that. Extremely 2______________ electronic systems control the work of huge plants, enterprises and 3_______________ stations. Electronic appliances are indispensable for planning and controlling our national _______________.

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Electronic computers are widely used in 1_______________ research аnd industrial designing. Huge radio-telescopes, 2_____________ with sensitive instruments and 3_______________ amplifiers enable man to gain an insight into the remotest corners of space, 4_________________ new and puzzling  phenomena of nature.

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The realm of 1 ______________ of to-day influences almost, every aspect of human activity, while it was only in the beginning of our century that the basic idea, which was to develop into one of the most astonishing sciences of our time, was conceived. It was our Russian 2______________ A. S. Popov, who discovered the principle of wireless 3______________ that finally led to the development of electronic 4______________ for use in various communication devices.

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Intensive 1______________ of radio-location began in the early forties. All these years the vacuum 2_______________ was the heart of electronics and, hence, the field of 3______________ was usually defined as the study of the motion of electrons in vacuum tubes. However, it was found that small, controlled 4______________ of gas introduced into a "vacuum tube" could make it perform switchings, rectifying and other jobs. To include the category of gas-filled tubes, "vacuum tubes" became converted to "electron tubes" and the science of electronics was expanded to include the study of electron motion in gases.

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The first semiconductor 1______________ was invented in 1948. It meant another important advance in the development of 2_____________. Semiconductors  possess  a number  of valuable 3______________ over electron  vacuum tubes, - miniature dimensions and high 4______________. Thus electronics became the study of electron motion in solids. The realm of electronics widened still more. This opened up other fields of application for electronics.