Concept and its measurement are the base of empirical research, so how to define brand advocacy is an important fundamental work of my research.

概念及其测量是实证研究的基础，因此，对品牌拥护的概念界定将是本次研究的一项非常重要的基础工作。

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Fundamental concept, electric parameters and their measurement methods of potentiometers are surveyed and basis to select types and caution in service of the potentiometers are emphasized.

综述电位器的基本概念、电气性能参数及其测量方法，侧重介绍电位器选型依据及使用注意事项。

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