硬盘系统相关的领域，如系统工程，业务系统的研究和定量分析。
Hard systems are associated with areas such as systems engineering, operations research and quantitative systems analysis.
确定截流倍数要考虑的因素比较多，如经济、环境、水文等，很难进行准确定量分析。
Rather more factors such as economic, environment and hydrology should be taken into account to confirm sewage closure multiplication factor and can hardly be quantitative analyzed.
射线衍射分析：材料结构的微观分析，如物相定性、定量分析，应力测试，织构分析等。
X-ray diffraction analysis: analyzing the microstructure of materials, such as phase qualitative, quantitative analysis, stress testing and structural analysis.
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