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新综合科学 牛津原版 3【2025|PDF|Epub|mobi|kindle电子书版本百度云盘下载】

新综合科学 牛津原版 3
  • 郑书皓编 著
  • 出版社: 上海:上海远东出版社;牛津大学出版社
  • ISBN:7806138706
  • 出版时间:1999
  • 标注页数:230页
  • 文件大小:68MB
  • 文件页数:238页
  • 主题词:

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图书目录

Unit 13 Food and TransportSubstances in food2

Food tests3

Functions of food8

Balanced diet13

Storing food19

More about food chains and food webs25

Teeth27

Tooth decay32

Digestion36

Absorption of food 41

Digestive juices43

A closer look at the digestive system44

More about enzymes45

Transport system in mammals48

Pulse and pulse rate56

Blood pressure58

Water balance58

The kidneys and their functions61

Nutrients for plant growth64

Absorption and transport of water in plants68

Xylem and phloem72

The main uses of water in plants72

Summary73

Difficult words79

Unit 14 Materials from the EarthThe Earth82

The soil91

Building materials96

Metals from the Earth's crust101

The pollution problem107

Coal111

Crude oil or petroleum117

Materials from the sea124

Water pollution129

More materials from the sea131

Chalk,limestone and marble135

Summary137

Difficult words142

Unit 15 Electricity and ElectronicsElectrostatics144

The Van de Graaff generator146

Looking at atoms-a revision150

Pushing charges152

Voltage and the voltmeter154

Safety with the mains voltage158

Dynamo effect159

Alternating current and direct current166

Transmitting electrical energy166

Transformers171

Power transmission173

Using electricity174

Power and energy176

Current in gas179

Lightning180

Fluorescent lamps185

Current in a vacuum185

Diode187

C.R.O.and TV197

Some useful electronic components197

Switches205

Electronic logic212

Applications of the AND gate 219

Summary 222

Difficult words 227

Index 228

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