China has a long history of freshwater aquaculture, which is the first country in the world to raise fish in ponds. Over the past 3000 years, people in China have accumulated rich experience in freshwater aquaculture. After the founding of People’s Republic of China, due to the attention of the party and the state and the superiority of the socialist system, the cause of freshwater aquaculture in our country has achieved rapid development, especially since the Reform and Opening up, the breeding water surface has been continuously expanded, breeding objects have been increasing, the breeding technology has been continuously innovated, and the breeding output and quality have been continuously improved, which greatly meets the growing demand of the people for aquatic products.
    This book is rich in content and covers a wide range of knowledge and technology. It is a very practical reference book, which can be read and used by water supply scientists, students of higher aquaculture institutions and the majority of aquaculture workers, in order to enrich knowledge accumulation, improve the level of science and technology, and guide production practice.
    Aquaculture is a subject based on biology and related to many subjects, such as chemistry, meteorology, nutrition, ecology, genetics, medicine, disease and fishing. Due to the lack of time and the limited level of editors, mistakes and omissions are inevitable. We sincerely invite readers to criticize and correct them in order to further improve and enrich them in the future.

前 言

我国的淡水养殖事业有着悠久的历史，是世界上池塘养鱼最早的国家。近 3000多年来，我国劳动人民积累了极为丰富的淡水养殖经验。新中国成立后，由于党和国家的重视及社会主义制度的优越性，使我国的淡水养殖事业获得了飞速的发展，尤其是改革开放以来，养殖水面不断扩大，养殖对象日益增多，养殖技术不断革新，养殖产量和品质不断提高，极大地满足了广大人民群众对水产品日益增长的需求。
  本书内容丰富，知识及技术涵盖面广，是一本实用性很强的工具书，可供水产科技工作者、高等水产院校生、广大水产养殖者阅读使用，以期充实知识积累，提高科技水平，指导生产实践。
  水产养殖是一门以生物学为基础与化学、气象学、营养学、生态学、遗传学、医药学、疾病学及捕捞学等多学科相关联的学科，牵涉面很广，由于时间仓促，加之编者水平有限，错漏之处在所难免，恳请广大读者批评指正，以期今后进一步完善和充实。

With the advent of the era of big data, the rapid development of various information technologies and the sharing and integration of massive information provide a large number of data and technical means for the development of urban and rural planning discipline, and bring it into the era of massive information space reading and writing and actual operation. China has launched various major strategic measures in promoting the coordinated and integrated development of urban and rural and regional economy. These strategic measures include promoting the coordinated development of new industrialization and agricultural modernization, the coordinated development of new urbanization and new rural construction, strengthening the construction of sustainable socialist ecological civilization, and the coordinated development of Beijing, Tianjin and Hebei. At present, facing these strategic tasks and measures, it is urgent to strengthen the theoretical and policy research in related fields.
    In the period of deepening reform, the research on the coordinated development of urban and rural and regional economy needs to continue to deepen, and it needs to comprehensively enrich the research in various fields. This book is not only an important academic work to study the theory and policy of the coordinated development of urban and rural and regional economy in China, but also a teaching material for graduate students majoring in economics and public management. Due to the limited scale and level of the research team and the limited research fields, the author hopes this book can promote and help the research on the coordinated development of urban and rural and regional economy, and also urges all colleagues to criticize and correct it.

前 言

随着大数据时代的来临，各类信息技术高速发展，海量信息的共享与融合，为城乡规划学科的发展提供大量数据与技术手段支撑，将其带入海量信息空间读写与实际操作的纪元。我国在推动城乡与区域经济协同发展、一体化发展中业已推出了各项重大战略举措。这些战略举措包括推进新型工业化与农业现代化协同发展、新型城镇化与新农村建设协同发展、强化可持续发展的社会主义生态文明建设、京津冀协同发展等。当前，面向这些战略任务与战略举措，亟待强化相关领域的理论与政策研究。
  在深化改革时期，城乡与区域经济协同发展的研究需要持续地深入下去，需要从各个领域全面丰富相关领域的研究。该书既是研究当前我国城乡与区域经济协同发展的理论与政策的重要学术著作，也是作为经济学、公共管理相关专业研究生专业课选用的教材。限于研究团队规模有限，水平有限，能涉猎的研究领域有限，既希望本书对城乡与区域经济协同发展的研究有所推进，有所帮助，也恳请各位同仁批评指正。

The latest national construction industry standard, “Professional Standard for Construction and Municipal Engineering Construction Site Professionals”, provides a basis for the scientific and reasonable standardization of post work standards and requirements of professional technical managers in the engineering construction industry. It plays a great role in improving the engineering management and technical level of professional technical management personnel, constantly improving the construction project management level and system construction, strengthening scientific construction and engineering management, and ensuring the project quality and safety production.
    With the continuous development of construction industry and the rapid development of construction technology, requirements for construction engineering technical management personnel are constantly changing and improving. In order to better implement and implement the national and industrial standards for the post work and quality requirements of engineering technicians, promote the engineering application of construction technology, improve the modern management level of engineering construction, we have organized and compiled this book. The purpose is to provide comprehensive and systematic technical knowledge for the engineering professional and technical personnel and to solve the needs of the actual construction work on site.
     Due to the short time and limited ability, there are some mistakes and imperfections in this book. Readers are welcome to criticize and correct them so as to make truly become an essential assistant for engineering and technical personnel through constant revision and improvement.

前 言

国家最新颁布实施的建设行业标准《建筑与市政工程施工现场专业人员职业标准》，为科学、合理地规范工程建设行业专业技术管理人员的岗位工作标准及要求提供了依据，对全面提高专业技术管理人员的工程管理和技术水平、不断完善建设工程项目管理水平及体系建设，加强科学施工与工程管理，确保工程质量和安全生产将起到很大的促进作用。
  随着建设事业的不断发展、建设科技的日新月异，对于建设工程技术管理人员的要求也不断变化和提高，为更好地贯彻和落实国家及行业标准对于工程技术人员岗位工作及素质要求，促进建设科技的工程应用，完善和提高工程建设现代化管理水平，我们组织编写了这本书，旨在为工程专业技术人员岗位工作提供全面、系统的技术知识与解决现场施工实际工作中的需要。
  本书主要内容包括市政工程施工员岗位基本要求，市政工程施工现场基础知识，市政道路工程施工现场管理，市政桥梁工程施工现场管理，市政排水工程施工现场管理等，内容丰富、实用，技术先进，是市政工程施工员施工现场工作的必备技术手册，也适合作为市政工程施工员岗前、岗中培训与学习教材使用。
  由于时间仓促和能力有限，本书难免有谬误之处和不完善的地方，敬请读者批评指正，以期通过不断地修订与完善，使本书能真正成为工程技术人员岗位工作的必备助手。

Ultrasound medicine refers to a non-invasive examination that uses the characteristics of ultrasound and the different principles of human tissue reflection on ultrasound to form images to diagnose the morphological structure, physical characteristics, functional status and pathological status of human tissue.
     Ultrasound medical diagnosis is widely used in clinical applications, with simple operation, convenient use, cost-effective, high accuracy, good localization, and high diagnosis rate of patients’ complications. Therefore, its clinical application is more extensive, providing the valuable reference information, and it can make a treatment plan in time and improve the success rate of first aid, especially in the diagnosis of some abdominal trauma and acute abdomen.It has a great effect on the development of the emergency medical system, which is recommended to provide this kind of diagnostic method for emergency patients in the clinic to improve the diagnosis accuracy of patients and improve treatment effect.
      Combined with the current social development status, this book introduces the related theories and knowledge of ultrasound medicine in many aspects, focusing on the current imaging research. The contents of the book are comprehensive, systematic and practical. It is s also suitable for teachers and students of medical imaging major in colleges and universities, and engineering and technical personnel engaged in ultrasound instrument sales, application training and hospital equipment management to learn and refer to.

前 言

超声医学是指应用超声波的特性和人体组织对超声反射不同的原理形成图像，来诊断人体组织的形态结构、物理特征和功能状态及病理状态的一种非创伤性检查。
  超声医学诊断临床应用广泛，其操作简单，使用便捷，性价比高，准确率高，定位性好，对患者的并发症也有较高的诊出率， 因此临床应用比较广泛，为临床诊断提供了有价值的参考信息，可以及时的制定治疗方案， 提高急救成功率。尤其是在一些腹部创伤和急腹症的诊断中效果突出，对于急救医疗体系的发展提供了较大的帮助，建议在临床中为急诊患者提供该种诊断方式， 提升患者的诊断准确率， 提升治疗效果。
  本书结合当前社会发展现状，从多个方面详细介绍了超声医学相关理论与知识，其中重点包含目前影像研究相关内容等。书中内容全面、系统、实用，亦适合大专院校医学影专业的师生，从事超声仪器销售、应用培训及医院设备管理的工程技术人员学习、参考。

In the 21st century, the world’s construction market is mainly in China, which is attracting worldwide attention. For this reason, many people of insight are optimistic about this opportunity, actively cultivate construction technology talents, and learn architectural design and construction technology.
    With the development of society, the construction industry and construction technology are developing rapidly, and the degree of building electrification and automation is getting higher and higher. The state has formulated and revised a number of new design standards and electrical construction specifications. Domestic and foreign new
electrical technology and new products and equipment are constantly used in practical projects, so it is urgent to have a comprehensive introduction to the design of building power supply, construction and installation, quality management, teaching reference and other aspects of the book.
    In order to meet the needs of the majority of construction engineering technical design and construction personnel, as well as the needs of the in-service construction engineering design, teaching and construction personnel, the author has compiled the comprehensive reference book, Research on electrical energy saving of building engineering. This book adopts the latest electrical graphic symbols and text marking specifications consistent with IEC (International Electrotechnical Commission), so as to connect with international standards.
  This book can be used as a comprehensive reference book for courses such as “building power supply design”, “building electrical construction” and “electrical engineering quality management”.
    This book is characterized by concise writing, illustrations and texts, and combination of theory and practice. So it is also suitable for self-study.

前 言

 在 21 世纪，全世界的建筑市场主要在我国，这是举世瞩目的。为此，许多有识之士看好这一机遇，积极培养建筑技术人才，学习建筑设计与施工技术。
    随着社会的进步，建筑工业和建筑技术正在迅速发展，建筑电气化、自动化程度越来越高，国家制定和修订了一批新的设计标准和电气施工规范。国内外的建筑电气新技术新产品和设备不断地应用于实际工程之中，因此迫切需要一本全面介绍建筑供电设计、施工安装、质量管理以及教学参考等方面的书籍。
    为了满足广大建筑工程技术设计和施工人员的需要及在职建筑工程设计、教学、施工人员的需要，作者编写了《建筑工程电气节能研究》这本综合性参考书。本书采用了与 IEC（国际电工委员会）一致的最新的电气图形符号及文字标注规范，以便和国际标准接轨。
   本书可以作为“建筑供电设计”“建筑电气施工”及“电气工程质量管理”等课程的综合参考书。也可以作为在岗的工程技术人员的工具书使用。
   本书的特点是文字简炼、图文并茂、深入浅出、理论联系实际。所以也适合于自学参阅。