绘制根轨迹时,我们通常是从Kg=0时的闭环极点画起,即开环极点是闭环根轨迹曲线的起点。起点数n就是根轨迹曲线的条数。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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