科技英语 第1册 基础部分PDF电子书下载

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Contents 1

Lesson One 1

Lesson Two 9

Lesson Three 17

Lesson Four 25

Lesson Five 36

Lesson Six 45

Lesson Seven 58

Lesson Eight 73

Lesson Nine 88

Lesson Ten 107

Lesson Eleven 128

Lesson Twelve 151

Lesson Thirteen 175

Lesson Fourteen 187

Lesson Fifteen 197

Lesson Sixteen 210

Lesson Seventeen 226

Lesson Eighteen 241

Lesson Nineteen 257

Lesson Twenty 275

Lesson Twenty-One 290

Lesson Twenty-Two 306

Lesson Twenty-Three 320

Appondix　附录 340

Vocabulary　词汇表 346

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