英语科普注释读物 科学知识 上PDF电子书下载

1．SOLID THINGS 1

2．LIQUID THINGS 5

3．GASES 9

4．SOLIDS,LIQUIDS,AND GASES 14

5．MOLECULES AND ATOMS 18

6．COMPOUNDS AND MIXTURES 23

7．CRYSTALS 27

8．CARBON 33

9．HOT AND COLD 38

10．HOW FRICTION CAUSES HEAT 44

11．HEAT AND ENERGY 49

12．BURNING 54

13．EXPLOSIONS 59

14．AIR 64

15．VACUUMS 69

16．SUCTION AND SYPHONING 75

17．CAPILLARY ACTION 80

18．FLOATING AND SWIMMING 86

19．PRESSURE AND PUMPING 91

20．GRAVITY-1 96

21．GRAVITY-2 101

VOCABULARY 105