Metals are materials most widely used in industry because of their properties. The study of the prod...: ответ на тест 110329 - Английский язык

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Metals are materials most widely used in industry because of their properties. The study of the production and properties of metals is known as metallurgy.
The separation between the atoms in metals is small, so most metals are dense. The atoms are arranged regularly and can slide over each other. That is why metals are malleable (can be deformed and bent without fracture) and ductile (can be drawn into wire). Metals vary greatly in their properties. For example, lead is soft and can be bent by hand, while iron can only be worked by hammering at red heat.

Metals are materials most widely used in industry because of their properties. The study of the production and properties of metals is known as metallurgy.
The separation between the atoms in metals is small, so most metals are dense. The atoms are arranged regularly and can slide over each other. That is why metals are malleable (can be deformed and bent without fracture) and ductile (can be drawn into wire). Metals vary greatly in their properties. For example, lead is soft and can be bent by hand, while iron can only be worked by hammering at red heat.
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A new material as nylon has been accepted. It is material for the manufacture of bearings and runners of all sizes in many types of machines, earth-moving equipment and agricultural machinery due to its fundamental characteristics of low friction and good wear resistance. Nylon is a very versatile material and is capable of overcoming a wide range of difficult problems. It will operate satisfactorily without lubrication in an abrasive atmosphere. One of its features is that nylon functions under water or is immersed in any other liquid. Being non-toxic nylon is frequently used in food machinery. Nylon gears usually do not require lubrication, they are shock-resistant, do not deform permanently and – running in train with metal gears – they outlast them.
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When will nylon operate satisfactorily without lubrication?

Learning styles are various _________ of learning.

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Many young urban girls today smoke. While smoking is bad for your health at any time, it is particularly so during pregnancy and result in an underweight, small-size baby, and so smoking is best avoided during pregnancy. It is amazing how people persist in smoking despite so much warning regarding its hazards.
It is unwise to hold a lighted cigarette while holding the baby. Smoke may also irritate baby and make him cough and sneeze.

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The US is a _______ consisting of 50 states.