凡是可用一阶微分方程描述的系统称一阶系统。
... First-order recursive discrete-time filters 一阶递归离散时间滤波器 First-order systems 一阶系统 Forced response 受迫响应 ...
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... 一阶微分环节 first derivative element; 一阶系统 first-order system; 一阶线性微分方程 linear first-order differential equation; ...
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一阶系统的过渡函数 admittances of a first-order system
多型变元一阶系统 Multiple-sorted System
一阶系统的最小二乘 first-order system least-squares
一阶无差系统 First order astatic system
一阶离散时间系统 First-order discrete-time systems
一阶连续时间系统 First-order continuous-time systems
一种无阶系统 a classless system
一阶类型系统 First-order Type Systems
扩展的一阶逻辑系统 EFOL
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研究了无穷边界的二阶椭圆问题，探讨了将其转化为一阶系统的最小二乘有限元逼近方法。
A least-squares mixed finite element methods for the first-order system formulation of second-order elliptic problems and a formulation for the infinite boundary conditions are presented.
l在过程和步骤已经确定的给定系统中，一阶变化是个变异，它使系统本身相对的不变。
First-order change is a variation in the way processes and procedures have been done in a given system, leaving the system itself relatively unchanged.
对光学系统输出刀口像的一阶导数做傅里叶变换，可以得到该系统的光学传递函数（OTF）。
The OTF (Optical Transfer Function) of an optical system can be evaluated by the Fourier Transform of the first derivative of the optical image of an knife-edge (object).
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