目的:了解浙江省动物间鼠疫的流行特征及现状，以期为全省鼠疫防控工作提供数据支撑。方法:采用回顾性研究，自“鼠疫防治管理信息系统......

The Northeast area plays an important role in grain production in China,and 25-30%of total national grain output is from......