运用RT—PCR和PCR技术对高热病期间陕西西安、宝鸡、渭南、榆林、汉中、商洛等地区猪场送检的146份样品进行猪繁殖与呼吸综合征病......

Fruit production and especially fresh tropical fruit trade, has an important relevance on world economy. Refining knowle......