简要介绍了GPS的优点及其工作原理，对GPS在林业调查中的使用方法及操作步骤进行了详细的描述，并探讨了其注意事项。
This paper introduces the advantages and working principles of GPS, elaborates the use methods and operation steps of GPS in forestry investigation, and probes into some matters needing attention.
本文对落帘涂布的原理进行了重点阐述，并讨论涂布缺点产生的机理、落帘涂布的优点及其在应用中的要求和注意事项。
This paper expounds the principles of curtain coating, discusses the mechanism for coating defects, describes its advantages and points out the requirements and matters in the application.
本文阐述了石油钻探过程中钻时参数的测量原理及其两种实用算法，并指出了在设计实现过程中的注意事项。
This article expatiate the theory and two kinds of practicable arithmetic of drilling time which used in the oil drilling process, and give notice of the two kinds in the design.
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