Вопрос № 32026 - Английский язык

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Why was the bald eagle chosen as the national bird of the new country?
In 1782, soon after the United States won its independence, the bald eagle was chosen as the national bird of the new country. American leaders wanted the eagle to be a symbol of their country because it is one of the strongest birds. Today the bald eagle has almost disappeared from the country. In 1972 there were only 3,000 bald eagles in the United States. The reason for the bird’s decreasing population was pollution of rivers by pesticides. Today, the American government and the American people are trying to protect the bald eagle. We are sure that the American national bird will remain a symbol of strength and courage.

In 1782, soon after the United States won its independence, the bald eagle was chosen as the national bird of the new country. American leaders wanted the eagle to be a symbol of their country because it is one of the strongest birds. Today the bald eagle has almost disappeared from the country. In 1972 there were only 3,000 bald eagles in the United States. The reason for the bird’s decreasing population was pollution of rivers by pesticides. Today, the American government and the American people are trying to protect the bald eagle. We are sure that the American national bird will remain a symbol of strength and courage.
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Vacuum
1. Evangelista Torricelli produced the first laboratory vacuum in 1643, and other experimental techniques were developed as a result of his theories of atmospheric pressure. A torricellian vacuum is created by filling a tall glass container closed at one end with mercury and then inverting the container into a bowl to contain the mercury.
2. The quality of a vacuum refers to how closely it approaches a perfect vacuum. Residual gas pressure is a primary indicator of quality, and is most commonly measured in units called torr, even in metric contexts. Lower pressures indicate higher quality, although other variables must also be taken into account.
3. Vacuum became a valuable industrial tool in the 20th century with the introduction of incandescent light bulbs and vacuum tubes, and a wide array of vacuum technology has since become available. The recent development of human spaceflight has raised interest in the impact of vacuum on human health, and on life forms in general.
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Vacuum
1. Evangelista Torricelli produced the first laboratory vacuum in 1643, and other experimental techniques were developed as a result of his theories of atmospheric pressure. A torricellian vacuum is created by filling a tall glass container closed at one end with mercury and then inverting the container into a bowl to contain the mercury.
2. The quality of a vacuum refers to how closely it approaches a perfect vacuum. Residual gas pressure is a primary indicator of quality, and is most commonly measured in units called torr, even in metric contexts. Lower pressures indicate higher quality, although other variables must also be taken into account.
3. Vacuum became a valuable industrial tool in the 20th century with the introduction of incandescent light bulbs and vacuum tubes, and a wide array of vacuum technology has since become available. The recent development of human spaceflight has raised interest in the impact of vacuum on human health, and on life forms in general.
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