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新综合科学 牛津原版 2PDF|Epub|txt|kindle电子书版本网盘下载
- 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：7806138692
- 出版时间：1999
- 标注页数：257页
- 文件大小：54MB
- 文件页数：267页
- 主题词：
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图书目录
Unit 7 Living Things and AirCommon gases2
Composition of the air6
What is air?10
Uses of the gases in air10
Breathed and unbreathed air11
What makes these differences?14
Respiration15
How air passes in and out of us17
Breathing in and out19
Different breathing systems23
Do plants respire?24
How do plants obtain energy?27
Most plants contain starch28
Photosynthesis 31
Oxygen/carbon dioxide balance33
Photosynthesis and food chains34
Food webs 34
The pollution of our air36
Summary 37
Difficult words 40
Unit 8 ElectricityUse of electricity 42
Conductors,insulators 48
Electric current49
Resistance 50
Lighting and heating effects53
Fuses and circuit breakers58
Electricity at home59
Magnetism 72
Electromagnets77
Electrochemistry 82
Summary85
Difficult words87
Unit 9 Heat TransferHeat energy92
Heat transfer in gases93
Convection in liquids96
Heat transfer in solids99
Conduction in air and water101
Radiation103
Applications of heat transfer108
How living creatures keep warm112
Summary115
Difficult words117
Unit 10 Hydrogen,Acids and AlkalisProperties of hydrogen120
Some uses of hydrogen122
Breaking down water123
Metals and water126
Reactivity134
Metals and acids135
Reacting with sulphuric acid137
Comparing reaction rates138
Reactivity series140
Acids and alkalis141
The pH scale145
Acid+Alkali=? 147
Neutralization and concentration150
Applications of neutralization154
Summary156
Difficult words159
Unit 11 Detecting the environmentOur senses and sense organs162
Light and eyes164
How a pinhole camera works166
Thick lens and thin lens172
Making sharp images174
How our eyes see objects174
How cameras 'see' objects175
Comparing the eye with the camera176
Normal eye,long and short sight176
Limitations of vision180
The noisy world183
Pitch188
Transmission of sound191
The range of hearing197
Taste and smell198
The sense of smell203
Skin 207
Into the brain 209
Persistence of vision212
Summary214
Difficult words217
Unit 12 Forces and MovementWhat is force?220
Friction 226
Weighing 231
Levers235
Using levers237
Human lever systems239
Work and energy242
Pulleys245
Action and reaction 247
Summary251
Difficult words 254
Index 255