单词：up-state
up-state的用法和样例：
例句
- A Small signal model set up through the aid of state space average method can do a world of good for Conducting high frequency Switching Power supply stable analysis.推证出用状态空间平均法建立小信号模型对高频开关电源进行稳定性分析的方法。
- The random excitations are first transformed into pseudo excitations before the non-uniformly modulated evolutionary random models are expressed by state space equations.先用虚拟激励法将随机荷载化为确定性荷载，然后将非均匀调制演变随机模型用状态方程表示。
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