针对这一特点，提出一套对县道公路网规划方案进行综合评价的评价指标体系，重点评价县道公路网的连通性和覆盖性。

Based on these characteristics, this paper puts forward a comprehensive evaluation criteria system which mainly evaluate the connection and covering level of county road network planning.

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对异步电动机磁场定向控制技术中的电流控制概念进行了分析，综述了近年来的各种电流控制方案，重点评述了基于PWM逆变器的各种电流控制技术。

This paper passes on the current control concept in the field-orientation control of induction motor drives presents recently current control techniques, reviews emphatically PWM current controllers.

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