中国海防：公司的业务主要涵盖电子防务装备领域、电子信息产业等领域

Core Viewpoint - The company, China Haifang, primarily operates in the fields of electronic defense equipment, electronic information industry, and professional technical services, focusing on the research, development, and production of underwater acoustic electronic defense products and electronic information products, along with providing related professional technical services [1] Group 1 - The company's business encompasses electronic defense equipment, electronic information industry, and professional technical services [1] - The company engages in research and development of underwater acoustic electronic defense products and electronic information products [1] - The company provides related professional technical services in its operational fields [1]