它的二阶导数就是这个恒加速度。

The second time derivative is the constant acceleration.

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本文在局部域的整数环上给出了一类逼近恒同核和关于它们的逼近阶估计的定理。

This paper gives a class of approximation identity operators on the integer domain of a local field, and a theorem on estimates of their approximation degree.

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目前，直流电机双闭环调速系统模型主要有理想模型、二阶线性模型以及在不考虑负载扰动或恒负载情况下的非线性模型等。

The DLM model mainly includes the ideal model, the second-order linear model and the non-linear model in constant load or without considering the load disturbance, and so on.

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