According to this reality, this article carried on the research about "The development of chemistry experiment substitute in country side junior middle school ".
二是确定了化学实验替代品的开发，主要从师生的角度论述怎样开发、如何制作的；
Frequency conversion adjusts the speed: this machine USES frequency conversion equipment, can be adjusted within the range according to the needs of reality in production.
变频调节速度：本机采用变频装置，根据实际生产的需要的范围内可以进行调整。
According to the general principles of emergency management and the reality of college features, this article discusses three theoretical issues: content selection, indexes determined, methods used.
本文从应急管理的一般原理和高校应急管理的现实特点出发，研究了高校应急管理能力评估体系在内容选择、指标确定、方法运用三个层面的理论问题。
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