on mark造句
例句与造句
- considering the comment of study result in geography for students based on marks, this theme, combined with the characteristics of geography and starting with the comment of study result in geography, researches the significance of the study result comment in geography, pressing need of reform and the basic ideas for the reform
本文针对当前学生地理学习效果评价中存在的以分数为主要评价依据的问题，结合地理学科的特点，从改革学生地理学习效果评价入手，探讨了学生地理学习效果评价的意义，进行改革的迫切性以及改革的基本构想。 - two strains of prrsv were isolated from the swine infected with prrsv in shangdong province and daqing area, in order to clarify the source and genetic background of porcine reproductive and respiratory syndrome virus ( prrsv ) from different parts of china, thus providing theoretic basis for the study of vaccine against it . the prrsv was cultured on mark-145 cells for 5 ~ ~ 6 passages . when the cpe was obvious, the virus was harvested and purified
为了弄清我国不同地区prrsv的来源以及其遗传学背景，为疫苗学研究提供理论根据，本研究在ch-1a株完整的基因组获得以后，从流行于我国山东(sd)和黑龙江大庆(dq)地区疑似prrs的猪体内分离到prrsv，在mark-145细胞上盲传56代，细胞出现明显病变以后，收获病毒液，然后提纯，提取全病毒rna，经过反转录、pcr扩增获得结构基因orf27的目的基因片断，然后与pmd-t载体连接，转化，得到阳性质粒后进行测序，并将其与ch-1a株进行了比较分析，同时对这两个毒株的结构基因组的理化性质进行分析。 - It's difficult to find on mark in a sentence. 用on mark造句挺难的
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