The development level of animal husbandry determines the development level of agriculture in a country. In recent years, the development of animal husbandry in China is very rapid, the total output of animal products is also on the rise, the per capita share has been greatly improved, the supply of animal products from the beginning in short supply,has changed into supply over demand, the production structure has been further optimized, animal husbandry has become the pillar industry of China’s agriculture and rural economy, and also it is the main way for farmers to get rich. However, in the past two years, due to the continuous decline of macro-economy, rising feed prices, animal epidemic prevention and control, food safety and other factors, coupled with the reduction of breeding profits, and the weak risk of prevention and control of farmers, the stable development of animal husbandry in China has been repeatedly frustrated in a downturn, the market of animal products has fallen into a trough, and the farmers have suffered losses seriously.
    Therefore, this book gives a detailed description of animal husbandry and disease control from six chapters, hoping to promote the development and progress of animal husbandry in China.

前 言

畜牧养殖业的发展水平决定了一个国家农业的发达程度。我国近些年畜牧养殖业发展十分迅速， 畜产品的总产量也正在呈上升趋势， 人均占有量得到了很大提高，畜产品的供应从一开始的供不应求，已经转变成了供大于求，生产结构得到了进一步的优化，畜牧养殖业已经成为了我国农业以及农村经济的支柱产业，同时也是农民致富的主要途径。可是在近两年，由于受到了宏观经济不断下滑、饲料价格不断上涨、动物疫情防控及食品安全等因素的影响，再加上养殖利润一度缩减、养殖户的防控风险较弱，使得我国畜牧养殖业的稳定发展屡遭挫折，一度出现低迷状态，畜产品的市场陷入了低谷，养殖户的亏损现象较为严重。
       因此，本书从六章内容对畜牧养殖与疫病防治进行详细的叙述，希望能够推动
我国畜牧业的发展与进步。

With the rapid development of economy, road and bridge has become an important carrier in the economic development of our country, which has a very important relationship with people’s travel directly. Municipal roads and bridges are the carriers to ensure the smooth travel of urban residents, which is of great significance for the development of the city. With the rapid development of current construction technology, different construction technologies will be adopted according to different structures in the construction of municipal road and bridge projects. However, no matter what construction technology is adopted, it is necessary to comply with the current engineering construction standards and ensure the quality of the project. Therefore, it is necessary to strengthen the construction management level of municipal road and bridge projects in this case.
      At the same time, in urban construction, urban economic construction and residents’living standards should be improved through the construction of municipal water supply and drainage projects, and urban infrastructure has gradually improved because of reasonable planning and construction. Therefore, in the construction of water supply and drainage projects, the most critical is management. In the construction of the project, whether the expected goal of construction management can be achieved or not will definitely affect the overall function of the water supply and drainage project. Therefore, it is particularly important to enhance the management of municipal water supply and drainage project construction.
   This book will elaborate on municipal road, bridge design based on life-cycle idea, bridge engineering construction, bridge detection and maintenance technology, municipal water supply and drainage engineering, etc.

前 言

随着经济的快速发展，道路桥梁已成为我国经济发展中的重要载体，直接与人们出行有着十分重要的关系。市政道路桥梁是保证城市居民得以顺利出行的载体，对于城市的发展有着十分重要的意义。当前施工技术的快速发展，在市政道路桥梁工程施工时会根据结构的不同而采取不同的施工技术，但无论采取何种施工技术，都要符合现行的工程建设标准规定，确保工程的质量，所以在这种情况下，加强市政道路桥梁工程的施工管理水平是十分必要的。
       同时，在城市建设的时候，城市经济建设和居民生活水平要通过市政给排水工程的建设来提高，城市基础设施因为合理规划和建设也渐渐的提高了。所以，在给排水项目施工的时候，最为关键的就是管理。在项目施工中，可不可以达到施工管理的预期目标，肯定会影响到给排水项目整体功能的有效发挥。所以，增强市政给排水项目施工的管理是特别重要的。
       本书将通过对市政道路、基于全寿命思想的桥梁设计、桥梁工程施工、桥梁的检测与养护技术、市政给排水工程等方面进行一定的阐述。

With the acceleration of social process and the development of the times, China has entered the crucial period of Reform and Opening up. In order to change the way of development and build a well-off society in an all-round way, it is necessary to strengthen the recognition of the importance of mechanical design and manufacturing, to enhance the importance of equipment installation and maintenance, and to increase the strength of innovation to speed up the development process of mechanical design. Workers should also improve their technical knowledge and level, enhance their comprehensive quality, strengthen the installation and maintenance skills for equipment, promote the rapid development of mechanical design industry, contribute their own strength to the development of China’s manufacturing industry, and promote the development and progress of China’s social economy.
    Nowadays, the world has entered the era of intelligence. Modern construction machinery is the product of intelligence. The rapid development of the national economy, especially the implementation of the western development policy, requires the construction machinery manufacturing industry to provide a large number of efficient construction machinery. In order to develop design ideas, shorten design cycle, reduce manufacturing costs and improve efficiency, we have compiled this book.

前 言

随着社会进程的加快和时代的发展，我国已经进入改革开放的攻坚时期。要努力转变发展的方式，全面建成小康社会，必须强化机械设计的制造的重要性认识以及提升对设备的安装和维修方面的重视程度，加大创新的力度加快机械设计的发展进程。工作者也要提高自身的技术知识和水平，增强自己的综合素质，加强对于设备的安装维修技巧，促进机械设计业的飞速发展，为我国的制造业发展贡献自己的力量，促进我国的社会经济的发展和进步。
        当今世界已进入智能化时代，现代建设机械是智能化的产物。国民经济的飞速发展，特别是西部大开发政策的实施，要求建设机械制造业提供大量高效能的建设机械。为了开拓设计思路，缩短设计周期，降低制造成本，提高使用效率，我们编著了此书。

In recent years, with the continuous improvement of China’s social and economic level, urban roads and other infrastructure construction are also developing, and the number of road and bridge projects is gradually increasing. In order to better meet the requirements of urban construction for road and bridge, it is necessary to continuously improve the construction and maintenance level of urban road and bridge, which not only determines the quality and service life of road and bridge, but also determines the development of the region to a certain extent. However, the construction and maintenance conditions of urban roads and bridges are complex and diverse, and there will be various problems. Therefore, it is very important to improve the construction and maintenance level of urban roads and bridges. Only in this way can we promote the continuous development of urban road construction and lay a solid foundation for the rapid development of urban regional economy.
       This book systematically expounds the urban bridge construction and road engineering from the content of 16 chapters. The chapters are comprehensive, hoping to contribute to the development and progress of urban road construction in China.

前 言

近年来，随着我国社会经济水平的不断提高，城市道路等基础设施建设也在不断发展， 道路桥梁工程数量逐渐增多。 为了更好地满足城市建设对道路桥梁的要求，就要不断提高城市道路桥梁的施工和养护水平，这不仅决定着道路桥梁的质量和使用寿命，也在一定程度上决定着区域的发展。但城市道路桥梁的施工与养护条件是复杂多样的，会出现各种各样的问题。因此，不断提高城市道路桥梁的施工和养护水平是至关重要的，只有这样才能推动城市道路建设的不断发展，为城市区域经济快速发展打下坚实的基础。
       本书从十六章内容系统的对城市桥梁施工与道路工程进行阐述，章节内容全面，希望能够有助于我国城市道路建设事业的发展与进步。

Since the beginning of the 21st century, in order to promote the sustainable and healthy development of economy and accelerate the process of socialist modernization, China has clearly put forward the urbanization strategy, and the speed of urbanization has been accelerating. The corresponding infrastructure construction, such as urban indemnificatory residential engineering, transportation facilities, urban water supply, gas supply and heating facilities has also developed. However, at present, the funds in China’s financial budget are far from meeting the needs of infrastructure construction. At the same time, the private surplus funds have expanded unprecedentedly and maintained stable development. How to make better use of these non-governmental capital and let it participate in the infrastructure construction of our country has become a realistic problem in front of us. The development of public private partnership (PPP) provides a way to solve this problem.
       After the 18th National Congress of the Communist Party of China, the country has strengthened the Reform and Opening up. From the first mention of PPP mode at the Third Plenary Session of the 18th CPC Central Committee to the introduction of relevant policies by the National Development and Reform Commission and the Ministry of Finance, PPP mode has been gradually popularized in China and relevant policies have been gradually improved. PPP model not only uses idle social funds to relieve the pressure of financial budget funds, but also enables the government and the private sector to establish a cooperative relationship in the field of infrastructure construction, develop strengths and avoid weaknesses, and complement each others’ advantages, so as to better play their respective roles and advantages, reasonably allocate resources, put an end to resource abuse, optimize the allocation of resources, improve the use efficiency of resources, meet the public demand, improve the social governance function, and ensure the quality of infrastructure and public products.

前 言

进入 21 世纪以来， 为促进经济的持续健康发展， 加快社会主义现代化建设进程，我国明确提出城镇化战略，城镇化速度不断加快，相应的城市保障性居住工程、运输设施、城市供水供气供暖设施等基础设施建设也随之发展。但是，当前我国财政预算内的资金远远无法满足基础设施建设的需要，与此同时，民间剩余资金却空前膨胀，且保持了稳定发展。如何更好地利用这些民间资本，让其参与到我国基础设施建设中，成为摆在我们面前的现实问题。政府和社会资本合作模式（Public Private Partnership，简称 PPP 模式）的发展为解决这一问题提供了思路。
       党的第十八次全国代表大会以后，国家加大了改革开放的力度。从党的十八届三中全会首次提到 PPP 模式，到国家发改委、财政部等陆续出台相关政策， PPP 模式在国内逐渐得到了普及，相关政策也得到了逐步完善。 PPP 模式不仅利用社会闲置资金缓解了财政预算资金压力，而且使得政府部门和私营部门在基础设施建设领域建立起合作关系，扬长避短，优势互补，从而更好地发挥了他们各自的作用以及各自的优势，合理调配资源，杜绝资源滥用，优化了资源的配置，提高了资源的使用效率，满足了公共需求，完善了社会治理功能，保障了基础设施和公共产品质量。