Multi-level principal-agency systems among share holder meeting, board of directors and managers realize the separation between ownership and actual control power.
股东会、董事会、经理层等之间的多重委托—代理制度，实现了所有权和实际控制权的分离。
The work principle, system structure, and pulse control strategy of the cell series multi-level converter are discussed in detail.
详细阐述了单元串联多电平高压变频器的工作原理、系统结构以及脉冲控制的策略。
The multi-level control structure is also established on the basis of hierarchical control structure.
并在大系统递阶控制结构的基础上，构建了模型体系的多级控制结构。
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