The achievement of Laser micro-probe spectrochemical analysis of doped element concentration in laser crystals is reviewed and several essential problems in its field are described.
本文概括介绍了激光微区光谱定量分析激光晶体中掺杂元素浓度的研究成果，着重讨论了定量分析中的几个主要问题。
Engineering seismic hazard analysis for a specified site represents an essential element of seismic safety assessment, and provides engineers with the standards of protection against earthquakes.
对工程场地的地震危险性分析是地震安全性评价的主要方法，并且为工程师提供抗震参数。
Engineering seismic hazard analysis for a specified site represents an essential element of seismic safety assessment, and provides engineers with the standards of protection against earthquakes.
对工程场地的地震危险性分析是地震安全性评价的主要方法，并且为工程师提供抗震参数。
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