一、关键词注解食品主权(Food Sovereignty)是一个尚在发展中的概念。这一概念由农民之路组织所提出,其目的是为了保护中小农民自......

Twenty broadband seismographs were deployed along Hongyuan, Sichuan to Wuwei, Gansu. 81 teleseismic events were recorded......

FNA涂层是一种表面处理新技术。以PSR-1自熔合金修复的内燃机进、排气阀与原装Co基堆焊气阀在NY型机车上进行对比试验,结果表明,二......