Ⅰ.Introduction　　Discourse analysis is connected with “the study of the relationship between the context in which it ......

Abstract　　This paper uses an Additive Neural Network model built with neural networks to analyze the key factors in de......

于2013-2014年，对河西走廊制种玉米田的病害进行了调查采集、分离培养、致病性测定与鉴定，其中病毒病采用观察组织中内含体和电镜观......