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What is Photocopier’s principle of action?

The is fabricated on the principle that positive and negative charges attract each other. When a paper with an image to be reprinted is...

Why do we usually have a thunderstorm in the summer?

Summer afternoon or early evening often gives us an unusually hot feeling. Moments later, suddenly, thunder rumbled, then flashed, the torrential rain, immense, the...

The principle of the air purifier?

In modern rooms and offices, due to air conditioners' use, the materials installed in the room also often contain chemicals that are harmful to...

What is the principle of the theft alarm?

In important places such as money, gold, silver, underground record storage, etc., if a fraudster suddenly sneaks in. the burglar alarm will immediately sound...

Why does tree lightning or ball-like lightning appear?

Late in the summer, fire clouds are often heated by the hot ground afternoon, plus the effect of exothermic condensation that develops into succulent...

What is the principle of the fire detector?

Fire harms human lives and property, damages the ecological environment. Fire prevention is a matter of concern to all humans. If it is possible...

What is an audio CD?

Edison's phonograph underwent constant innovation to become a popular electric phonograph. It is made up of the motor, the turntable, the receiver, and the...

Why is the solar system structured as it is today?

As we know, the solar system does not necessarily have to be structured as it is today. It can be arranged differently. Many solar...

Why must we observe the Antarctic meteorology?

Why do scientists of many countries do not mind as far away as the ice-filled Antarctica, there is no human shadow of the Earth...

What makes the sunshine and heat?

Looking at the star at night and the sun during the day, one could hardly believe it was the same type of celestial body....

What is the earth made of?

The most general answer to this question is probably: the earth is a ball made of almost stone. Please be clear: bluestone. Inside the...

Why is the temperature and temperature change in the Northern Hemisphere more variable than in the Southern Hemisphere?

Why is the temperature and temperature change in the Northern Hemisphere more variable than in the Southern Hemisphere? In one year, the Sun is shining...
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What is color television?

The human eye sees an object and can see its colors because the light it emits, or light from its surface, bounces off, enters...

What is an audio CD?

Edison's phonograph underwent constant innovation to become a popular electric phonograph. It is made up of the motor, the turntable, the receiver, and the...

What is the principle of the fire detector?

Fire harms human lives and property, damages the ecological environment. Fire prevention is a matter of concern to all humans. If it is possible...

What is the principle of the theft alarm?

In important places such as money, gold, silver, underground record storage, etc., if a fraudster suddenly sneaks in. the burglar alarm will immediately sound...