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Published by Beijing University of Posts and Telecommunications, 1991
ISBN 10: 7563511784ISBN 13: 9787563511785
Seller: liu xing, Nanjing JiangSu, JS, China
Book
paperback. Condition: New. Language:Chinese.Paperback . Publisher: Beijing University Press. The book is divided into 8 chapters. These include: the concept of signals and systems; continuous system.
ISBN 10: 7302423571ISBN 13: 9787302423577
Seller: liu xing, Nanjing JiangSu, JS, China
Book
paperback. Condition: New. Language:Chinese.Foreign business letters.
Published by Social Science Literature Press, 2022
ISBN 10: 7520197379ISBN 13: 9787520197373
Seller: liu xing, Nanjing JiangSu, JS, China
Book
paperback. Condition: New. Paperback.Pub Date:2022-04-01 Pages:244 Language:Chinese Publisher:Social Science Literature Publishing House This book aims to comprehensively and systematically analyze the Chinese people's sleep status. sleep problems and their impact in the context of social changes. The book is mainly divided into three parts. The first part is social changes and sleep quality: the research team constructed the China Sleep Index and analyzed the characteristics of changes in the sleep status of Chinese r.