This paper presents a PN-based description method of control system.

介绍了一种基于PN的控制系统描述方法。

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There is also a northward current at the eastern most part of Section PN.

在PN断面最东部分，也存在一支北向流。

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There is also a northward current at the eastern most part of Section PN.

在PN断面最东部分，也存在一支北向流。

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