The article mainly the speed governing technology with internal feedback high frequency chopper wave, including its working principle, function and feature, and application to Industry control.

简介几种常用电机调速方式。对应用较好的内反馈高频斩波调速技术的工作原理、功能与特点，以及在工业控制中的应用情况予以介绍。

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This dissertation starts with the internal control theories including its function, key points and method, as well as the special characteristics of internal control of an enterprise groups.

本文从内部控制的相关理论入手，分析企业集团内部控制的功能、关键点、手段，以及企业集团在内部控制上的特殊性。

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When assessing the effectiveness of internal control over financial reporting and compliance with financial-related laws and regulations, management must follow the assessment process contained in Appendix A. Annually, management must provide assurances on internal control in its Performance and Accountability Report, including a separate assurance on internal control over financial reporting, along with a report on identified material weaknesses and corrective actions.

WHITEHOUSE: OMB Circular A-123 - Management's Responsibility for Internal Control | The White House