Fifth Grade Science Volume 1, Textbook Edition
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Science Edition for Sixth Grade Science Volume 1
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Third Grade Science Volume 1, Textbook Edition
Fourth Grade Science Volume 2, Textbook Edition
Fourth Grade Science Volume 1, Textbook Edition
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Qingdao Edition Fourth Grade Science Volume 2
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E-education edition fifth grade science volume 2
E-education edition sixth grade science volume 1
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Fifth Grade Science Volume 2, Textbook Edition
Qingdao Edition Fourth Grade Science Volume 1
| Category | Format | Size |
|---|---|---|
| Qingdao Edition Fifth Grade Science Volume 1 | pptx | 6 MB |
Qingdao Edition Fifth Grade Science Volume 1
2024-11-03
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Description
"The Harm and Prevention of Noise" PPT
Part One: Content Import
1. Noise
In physics, the sound produced when a sound-emitting body vibrates irregularly is called noise.
From the perspective of environmental protection, any sound that hinders people's normal rest, study and work, as well as any sound that interferes with the sounds people want to listen to, is noise.
2. Source of noise
traffic noise
industrial noise
construction noise
social life noise
3. Noise intensity level
Urban environmental sound intensity and standards in my country
Part Two: Controlling Noise
The three stages of sound from production to hearing
vibration of sound source
prevent noise
Propagation through air and other media
Block the spread of noise
Received by the human ear (vibrations of the eardrum)
Prevent noise from entering your ears
Keywords: Qingdao edition fifth grade science PPT courseware free download, noise hazards and prevention PPT download, .PPT format;
For more information about the "Hazards and Prevention of Noise" PPT courseware, please click the "Hazards and Prevention of Noise" ppt tag.
"Hazards and Prevention of Noise" PPT courseware download:
"The Hazards and Prevention of Noise" PPT courseware download Part 1 content: Sources of noise 1. Noise from a physical perspective: it is the sound emitted when the sound-emitting body vibrates irregularly. 2. Noise from an environmental protection perspective: Any noise that hinders people Work and study affect people's lives...
"Hazards and Prevention of Noise" PPT download:
"The Harm and Prevention of Noise" PPT download Part 1: Noise Do you know? What is noise? Noise is noise. It is a type of sound that causes people to be irritated or whose volume is too strong and endangers human health. From the perspective of environmental protection, anything that affects people's normal...
"Hazards and Prevention of Noise" PPT courseware:
"The Harm and Prevention of Noise" PPT courseware Explore: The sources of noise Explore: How do people control and eliminate noise pollution? Methods to prevent and control noise: 1. Control noise sources 2. Block noise transmission 3. Attenuate noise at the human ear Thinking: What are the noises around us? ..
File Info
Update Time: 2024-11-03
This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 1 industry PPT template
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Qingdao Edition Fifth Grade Science Volume 1
2024-11-03
Copyright statement: This material is compiled and released by the user of Daoge Resources. The copyright belongs to the author. For commercial use, please contact the copyright owner. If there is any infringement, please contact the webmaster to remove the resource.
Download Points: 0.00
Free Download
Upgrade VIP
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Views: 4019 / Downloads: 405
