美国学者迈克尔波特将国家优势的发展阶段分为四个阶段,即要素驱动阶段、投资驱动阶段、()、财富驱动阶段。 ["科技驱动阶段","人才驱动阶段","创新驱动阶段","理论驱动阶段"]
You want to limit access to a method of a public class to members of the same class. Which access modifier accomplishes this objective?() [" Public"," Private"," Protected"," Transient"," No access modifier is required"]
证据保全
Ames试验利用的材料为()型的鼠伤寒沙门氏菌,该菌在缺乏或少含量的()的低营养培养基上不能生长。
在强化企业在创新中主体地位的措施中,下列哪项措施不是支持企业推进重大科技成果产业化的具体措施() ["建立健全按产业发展重大需求部署创新链的科研运行机制","推进新技术、新材料、新工艺、新模式、高端装备等的集成应用","对企业加强资金支持","运用高新技术改造提升传统产业"]
胶糖果质构特征受哪些因素制约?