河海大学是国家“双一流”重点支持的综合性大学之一，拥有广泛的学科覆盖范围。截至目前，河海大学共有多少个A类学科呢？让我们来一探究竟。

在河海大学的学科设置中，A类学科是指具有较高学术水平和应用价值、在国内外具有较大影响力的学科。这些学科通常在人才培养、科学研究和社会服务等方面处于领先地位。

河海大学作为一所工科为主的高校，其A类学科涵盖了很多工程技术类学科。例如土木工程、水利工程、港口与航道工程、电气工程等学科都属于A类学科。这些学科在我国的建设和发展中具有重要地位，培养了大批优秀的工程技术人才，并取得了丰硕的科研成果。

除了工程技术类学科，河海大学还在自然科学、环境科学、经济学、管理学等领域拥有多个A类学科。物理学、化学、信息与通信工程、能源与动力工程等学科在自然科学领域中占有重要地位。环境科学与工程、生态学等学科则致力于研究环境保护和可持续发展问题。经济学、管理学、金融学等学科在培养应用型人才和推动经济社会发展方面发挥着重要作用。

河海大学还注重跨学科的发展，积极培育交叉学科的发展优势。例如，信息与计算科学、数学与应用数学等学科涵盖了计算机科学、数据分析、人工智能等多个领域，在推动科技创新和发展中发挥了积极作用。

截至目前，河海大学已拥有超过30个A类学科，覆盖了工程技术、自然科学、社会科学等多个领域。这些学科的建设和发展为培养高素质人才、推动科学研究和服务社会做出了重要贡献。

In English:

How Many A-Class Disciplines Does Hohai University Have?

Hohai University is one of the key universities in China, supported by the national "Double First Class" initiative. It has a wide range of disciplines. How many A-class disciplines does Hohai University have? Let's explore it.

In the discipline setting of Hohai University, A-class disciplines are those with high academic level and practical value, and have significant influence both domestically and internationally. These disciplines are usually at the forefront in talent cultivation, scientific research, and social service.

As a university with a focus on engineering, Hohai University has many A-class disciplines in engineering and technology. Disciplines such as civil engineering, water conservancy engineering, port and waterway engineering, and electrical engineering are all classified as A-class. These disciplines play an important role in the construction and development of our country, cultivating a large number of excellent engineering and technical talents and achieving fruitful research results.

In addition to engineering and technology, Hohai University also has multiple A-class disciplines in natural sciences, environmental sciences, economics, and management. Disciplines such as physics, chemistry, information and communication engineering, and energy and power engineering hold important positions in the field of natural sciences. Environmental science and engineering, ecology, and other disciplines are dedicated to studying environmental protection and sustainable development issues. Disciplines such as economics, management, and finance play a critical role in cultivating applied talents and promoting economic and social development.

Hohai University also emphasizes interdisciplinary development and actively cultivates the advantages of interdisciplinary research. For example, disciplines such as information and computing science, mathematics and applied mathematics cover various fields such as computer science, data analysis, and artificial intelligence, playing an active role in promoting technological innovation and development.

As of now, Hohai University has more than 30 A-class disciplines, covering engineering and technology, natural sciences, social sciences, and other fields. The construction and development of these disciplines have made significant contributions to talent cultivation, scientific research, and serving society.