The changing status of this frontier is one of the characteristics and the basic model of the formation and historical variations of China's northwest frontier.
西北疆域地位不断演变，是西北疆域变迁史的基本特点之一，也是西北疆域形成过程的基本形式。
By adjusting dynamic fuel pump rack position, closed loop of engine speed in suddenly changing of load was realized in this model. It could keep engine speed stability in different status of engine.
通过动态调整油泵齿条位置实现对柴油机突变负载下转速的闭环控制，从而保证在不同工况下转速的稳定性。
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