英语 第3册PDF电子书下载

Lesson One Man-made Materials 1

Lesson Two Fire 17

Lesson Three The Influence of Metallurgy on Civilization 34

Lesson Four Metallurgy and Engineering 52

Lesson Five Lead——One of the Heaviest Metals 70

Lesson Six Iron and Iron Rust 87

Lesson Seven Cost of Corrosion 108

Lesson Eight Advantages and Limitations of Powder Metallurgical Methods 127

Lesson Nine Equilibrium 145

Lesson Ten Mechanical Working of Metals 165

Lesson Eleven Metals and Non-metals 183

Lesson Twelve From Rails to Needles 201

Vocabulary 226

Bibliography 254