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19．Chairman Mao Tse-tung Talks with Guests from Asia,Africa and Latin America&(A.R.) 1

(Same as above)&(S.R.) 6

20．The Solar System&(A.R.) 10

The Sun;U S.S.R Builds Solar Boiler&(S.R.) 14

21．The Thought of Mao Tse-tung is the Victoriou Banner of the Great Revolution of the Chinese People&(A.R.) 18

(Same as above)&(S.R.) 24

22．The Chemist in the Steel Mill&(A.R.) 27

(Same as above)&(S.R.) 32

23．Inside the Atom&(A.R.) 35

Eyes That See Through Atoms&(S.R.) 40

24．The Technical Transformation of China's Agriculture&(A.R.) 42

(Same as above)&(S.R.) 47

25．The Properties of Gases&(A.R.) 50

Gas Analysis&(S.R.) 55

26．Electricity Today&(A.R.) 58

(Same as above)&(S.R.) 63

27．Agriculture:Foundation of the National Economy&(A.R.) 66

(Same as above)&(S.R.) 72

28．The Physical Properties of Substances&(A.R.) 75

The Nature and Properties of Matter&(S.R.) 80

29．Elements,Compounds and Mixtures&(A.R.) 83

Elements,Elementary Substances and Compounds&(S.R.) 88

30．Long Live Leninism&(A.R.) 91

(Same as above)&(S.R.) 95

31．Satellite Will Be Useful&(A.R.) 99

Earth Satellite,The Second Artificial Earth Satellite&(S.R.) 104

32．Heat,Steam,and Power&(A.R.) 108

(Same as above)&(S.R.) 113

33．Northeast China—Heavy Industry Base&(A.R.) 115

Everyone a Geologist&(S.R.) 121

34．China's Chemical Fertilizer Industry Leaps Forward&(A.R.) 127

(Same as above)&(S.R.) 132

35．Radioactive Elements&(A.R.) 135

Radioactivity;What is An Isotope?&(S.R.) 140

36．Ultrasonics&(A.R.) 143

Ultrasonic Waves in Our Life&(S.R.) 148

37．New Atomic Reactor and Cyclotron&(A.R.) 151

Atomic Fission&(S.R.) 158