Natural gas(NG)is among the most used fossil fuels in industrial and domestic sectors.When extracted,it often contains w......

目的 观察在基层地区推广高血压适宜技术的防治效果和经济学意义,寻求可行性的高血压防治方案.方法 对推广社区为期2年的系统管理......

The rice-duck ecological system is one of the major practices of the traditional Chinese agriculture. A study on the eff......