The frequency converter for oil transfer pump and multistage control for electrohydraulic valve are used to prevent water hammer in oil pipe, and improve the efficiency and safety in oil transmission.

输油泵采用变频器进行调控并结合电液阀的多段控制，避免输油管路产生水击，提高了输油作业的工作效率和安全性。

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This paper presents the multistage and distribution expert integrated system for the command and control strategy.

本文介绍了关于指挥和控制策略的多专家集成的多级、分布式专家系统。

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Multistage method was used to control the quantity of pathogen.

其防治采用多环节控制病原数量。

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