...范例-论文写作必看 关键词］改造的必要性；抽汽改造内容及运行方式；经济效益和社会效益 [gap=362]keywords]necessity of reform; steam extraction transformation contents and operation mode; Economic benefit ..
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介绍了高空台空气降温系统技术改造的必要性和改造的原则。
This paper introduces the necessity of technical improvement and the design principles of an air cooling system for simulated altitude test facility.
提出了通风机改造的必要性，列出了风机改造的原理及注意事项。
The necessity of fan transformation is put forward. The principle and cautions of fan transformation is listed.
就当前普通物理实验领域普遍存在的问题作了分析，提出了改造的必要性。
This thesis analyses the problems that exist in the fields of current normal physics experiment, indicated the necessity of improvement.
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