Вопрос № 912156 - Английский язык

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 _____ is a pressure measuring instrument, usually limited to measuring pressures lower than atmospheric.

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Some measuring 1_______ are fitted with dials. To prevent 2_______ readings, always read the dial correctly. Read the deal from 3_______ in front so that the reflection is behind the needle. If the 4_______ is not viewed from the front the reading will be incorrect.

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How many types of atom does carbon dioxide have?
Aluminium (Al), water (H2O), oxygen (O2) and carbon dioxide (CO2) are substances. Some substances are elements and some substances are compounds. Elements have only one type of atom whereas compounds have more than one type.
Aluminium is an element: it has only one type of atom (i.e. it has only aluminium atoms). Oxygen has only one type of atom, so it is also an element.
Carbon dioxide has two types of atom (carbon and oxygen), so it is a compound. Sulphuric acid (H2SO4) is also a compound: it has three types of atom (hydrogen, sulphur and oxygen). Water is also a compound.

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How many times did Gagarin orbit the Earth?
A Russian cosmonaut (astronaut) named Yuri Gagarin, who graduated from the Air Force school at Orenburg in 1957, made the first manned spaceflight. He was launched into space aboard the spacecraft Vostok 1 on April 12, 1961. He orbited the Earth once in one hour and 29 minutes reaching a maximum altitude of 187 miles (301 kilometres). The ship landed the same day at 10:55 a.m. It was Gagarin’s only space flight.

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Squares and rectangles are shapes. Squares have four sides. Rectangles also have four sides. Triangles do not; they have three sides. Circles are also shapes but they do not have sides.

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An electric current is a flow of electricity. There are two kinds of electricity, positive and negative. Glass rubbed with silk is positively charged, ebonite rubbed with fur is negatively charged.
Like charges repel, unlike charges attract. The leaf electroscope is used to detect, distinguish and measure charges.
The ultimate particle of negative electricity is called the electron; that of positive electricity is called the proton.