展览业目前已成为一个重要的行业，世界各大都市争建各类规模宏大的展览场馆就是明证。展览业的作用，从微观上说有利于企业、行业推销自己的产品，交流新技术、新专利；从宏观上说对展示一个国家、一个地区的实力和文明程度，都有不可替代的作用。水利行业作为受计划经济影响? The exhibition industry has now become an important industry. The demonstration of various large-scale exhibition venues in major cities around the world is a demonstration. The role of the exhibition industry, from a micro perspective, is conducive to companies, industries to promote their own products, exchange of new technologies and new patents; from a macro point of view, to demonstrate the strength and civilization of a country, an area, have an irreplaceable role. Water conservancy industry as affected by the planned economy?