Прочитайте текст и определите какой из заголовков соответствует тексту All engineering materials are...: ответ на тест 439264 - Английский язык

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All engineering materials are divided into metals and non-metals. Copper, cast iron, aluminium are examples of metals. Rubber, plastic and ceramics are examples of non-metals. Today different metals are widely used in machine-building industry.

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All engineering materials are divided into metals and  non-metals. Copper, cast iron, aluminium are examples of metals. Rubber, plastic and ceramics are examples of non-metals. Today different metals are widely used in machine-building industry.

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We can divide all metals into ferrous and non-ferrous. Steel and cast iron are in the group of ferrous metals. They are alloys of iron with carbon, manganese, silicon and other components.
Non-ferrous metals are metals and alloys the main component of which is not iron but some other element such as aluminium, copper and others. Some of the characteristics of non-ferrous metals are high electric and heat conductivity, high corrosion resistance, light weight and easiness of fabrication.

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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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Wood used for construction purposes is usually changed into laminated wood or wood panel products. Large structural wooden members are produced by glueing small strips of wood together.
Wood in panel form is more advantageous for many building purposes than board. Why is it so? First of all, because wood panels are much easier to install than boards. They require much less labour for the process of installation. Besides, swelling and splitting in panels are greatly decreased compared with boards. As to plywood panels, they are made up of thin wooden veneers glued together. It is of great importance to note that when wooden structures are designed the future stresses of their structural members must be predetermined.

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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.