The paper proposes an approach to design a dual-loop variable structure controller for a particular class of singularly perturbed dynamic systems.

针对一类典型的奇异摄动动力学系统提出了双回路变结构控制器的设计方法。

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We never made any proposal that involved a dual-class shareholding structure.

我们从未提议任何双层持股结构。

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Since 1986, when Dow Jones introduced a dual-class share structure, the family has cut its overall shareholding from 54.7% to 24.7%.

在1986年道琼斯开始实行两类股票结构之后，该家族在道琼斯的股份从54.7%降到了24.7%。

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Since 1986, when Dow Jones introduced a dual-class share structure, the family has cut its overall shareholding from 54.7% to 24.7%.

在1986年道琼斯开始实行两类股票结构之后，该家族在道琼斯的股份从54.7%降到了24.7%。

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