first derivative element
... 一阶微分方程 first-order differential equation; 一阶微分环节 first derivative element; 一阶系统 first-order system; ...
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可以证明本系统的这种观测量是伺服阀的负载压力，而所谓补偿器是一个一阶微分环节，因而容易实现。
It also testifies the intermediate variate in the system is servo valve loading pressure ; compensator is a first derivative element.
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