为配合国家天然气资源的开发利用，适应国家环境保护政策，响应西安市政府提出的“还我蓝天”的口号，本着限制使用以煤为燃料的锅炉，降低城市污染，加大环保力度的精神，最近，航天四院７４２２厂研制生产的燃油、燃气锅炉正陆续投放市场。该厂为使产品早日投放市场，研制人? In line with the development and utilization of the national natural gas resources and the national environmental protection policies, in response to the slogan “To Return My Blue Sky” put forward by the Xi’an Municipal Government, in the spirit of restricting the use of coal-fired boilers, reducing urban pollution and enhancing environmental protection efforts Recently, the fuel oil and gas boilers developed and produced by 7422 Aerospace Fourth Hospital are being put on the market one after another. The plant to make products as soon as possible on the market, research people?