But when art history paid more attention to it ' s particularity , the universality of history was ignored , especially the study of art history couldn ' t absorb excellent methods from modern history theory , nor apply it to its own approach 但是，在过于关注自身研究材料和方法特殊性的同时，忽略了它作为历史研究的普遍性特征，尤其是不能从现代历史学理论中吸收优秀的研究方法，缺乏艺术史原初的融汇能力。
Method : 120 rabbit vessels were randomly divided into three groups : the vessel of control group in cryopreservative medium containing calf serum were subjeted to rate - controled slow freezing ; those of experiment group i in cryopreservative medium containing mixed animo acids were frozen by the same method as in control group ; and those of experiment group ii in the same cryopreserative medium as in control group were subjected to rapid freezing 材料和方法：取中国纯种家兔股动脉120段，随机分为3组：对照组用含胎牛血清的保护液处理，以慢冻方式降温；实验组1用含复方氨基酸的保护液处理，以慢冻方式降温；实验组ii用含胎牛血清的保护液处理，用速冻方式降温。
Materials and methods : fecal , cloacal and tracheal swabs from different types of poultry were collected in 6 live - bird retail markets once a week . they were inoculated into 9 - 11 days embryonated chicken eggs and incubated in 35 " c for 72 hours . hi and nl assays were performed to detect the subtype of viruses if ha test were positive ( ad ^ 16 ) and contamination test were negative 材料和方法：每星期收集一次标本，收集的标本常规处理， 9 - 11日龄鸡胚尿囊腔接种， 35培养72小时，收取尿囊液，血凝阳性( ad 16 )且细菌培养阴性者- 70保存并进一步做hi ， ni实验鉴定亚型。
The present dissertation mainly deals with the morphlogy , taxonomy , geographical distribution and phytogeny of empoascini from china . the history and present situation both in china and abroad , its morphology , geographical distribution , economial importance , material and methods are introduced and discussed 综述了小绿叶蝉族分类的历史沿革、国内、外研究概况、研究材料和方法、经济意义、分类特征、世界及中国属、种的地理分布，进行了中国小绿叶蝉系统分类。
The information generated in current study suggests that the developing influenza ecosystem in southern china region may play an important role in the process of emerging novel influenza viruses , even directly impact the genesis of pandemic influenza strains . materials and methods : fecal , cloacal and tracheal swabs from different types of poultry were collected in live - bird retail markets once a week . they were inoculated into 9 - 11 days embryonated chicken eggs and incubated in 35 for 72 hours 本课题意在: 1 、以pa和cu为代表，探讨hgnz亚型流感病毒在这些新形成的小种群中的流行情况; 2 、探讨这些小种群中流感病毒的来源:是从其它动物跨种属传递而来，还是本身为流感病毒的天然宿主: 3 、探讨这些新形成种群中hgnz亚型流感病毒的进化情况，以及其在整个流感病毒生态体系中的作用;材料和方法:每周采集标本一次，常规处理后，接种于9一n日龄鸡胚尿囊腔， 35恒温培养72小时，收取鸡胚尿囊液。
