Objective: To establish a highly efficient production system of chimeras by perfecting and normalizing the key steps of technology system of gene knockout mice.
目的：完善和规范基因剔除小鼠技术体系的关键技术环节，建立一套高效的嵌合体制备体系。
In this paper the high efficient technology of virus free minituber production of potato under cold condition in the cold area of northwestern Hebei was studied.
试验研究了在冀西北高寒区冷凉气候条件下脱毒微型薯的高效生产技术。
It is suggested to intensify the development of efficient Ag-catalysts, to raise production technology of ethylene glycol, to enhance technical management, and to reduce production costs.
分析了国内外乙二醇的生产、消费、进出口情况以及主要生产商的竞争态势，建议加强高效银催化剂的研制开发，提高乙二醇生产技术，加强技术管理，降低生产成本。
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