Прочитайте текст и определите какой из заголовков соответствует тексту Yesterday from 4 till 6 o’clo...: ответ на тест 284182 - Английский язык

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Yesterday from 4 till 6 o’clock Ann and Alice were working in the laboratory. They were studying different electrical devices and instruments. One of them, a multimeter, was on their demonstration table all the time.
The multimeter is used for measuring three types of electrical units, namely: voltage, resistance and current. This device has several scales, a needle, a function selector, two leads, a crocodile clip and a probe.

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Yesterday from 4 till 6 o’clock Ann and Alice were working in the laboratory. They were studying different electrical devices and instruments. One of them, a multimeter, was on their demonstration table all the time.
The multimeter is used for measuring three types of electrical units, namely: voltage, resistance and current. This device has several scales, a needle, a function selector, two leads, a crocodile clip and a probe.

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Henry Cavendish was born in 1731 and died in 1810. He was an English nobleman who did scientific experiments as a hobby. In 1781 he made the important discovery that water is not an element but a compound of the gases we now call hydrogen and oxygen. He described his experiments to the Royal Society in 1785.
His method was new. He showed that if electric sparks are passed through a mixture of hydrogen and oxygen the two gases combine explosively and form water. This was a dangerous experiment. Cavendish did his experiment safely;
he wisely used a strong brass container for the gases. He also passed electric sparks through air and found that gases which readily dissolve in water form acids. We explain this reaction today as follows: oxygen and nitrogen combine and form oxides of nitrogen.
Cavendish also noticed that air contained a small proportion of a gas which did not combine with any other gas even if we pass electric sparks through it for a long time. Now we think that this gas was probably argon, one of the inert gases. It was rediscovered many years later.

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     In algebra, letters are used to express the general properties of numbers.
     Representing one number by the letter a and another by the letter b, we can write the equality.
                                   a x b=b x a
or, more shortly, ab=ba.
     If no other sign is indicated, the multiplication sign is understood between any two letters written side by side.
     To represent numbers letters of the Latin alphabet are generally used.

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“Colorplast” factory in Rovigo (Italy) manufactures three main products: panels, window frames and door frames.
The rigid, extruded polyvinylchloride (PVC) panels are made in a large of sizes, suitable for every kind of use. They are very strong, indeformable and are extremely easy to assemble and disassemble. For this reason they are of particular interest to architects and builders.
The second group of “Colorplast” products are ready-to-mount window frames, made of rigid PVC. They are completely draught-proof, water-proof, fire-proof and sound absorbent, indeformable, easy to install, economic and do not require maintenance. Moreover, they are available with different types of openings in varying sizes and are designed to meet any specific requirement.
       Finally, “Colorplast” produces patented internal laminated plastic melamine doors. They are made up of laminated panels with noney-comb filling, finished with rigid PVC borders.

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International trade means there are more companies competing with each other to sell their products. This means lower prices, which is good for customers because they pay less and have more choice. Producers, however, make less profit. Multinational companies often look for ways to reduce their costs, for example, by manufacturing their products in countries where labour costs are cheap.