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自 动 控 制 原 理第 四 章 复 域 分 析 法 - 根 轨 迹 法将 K 代 入 整 理 , 得 到( σ + ) + = −2 2 2b ω b ba显 然 这 是 以 σ, ω 为 变 量 的 圆 的 方 程 , 其 圆心 坐 标 为 (-b,0), b 半 径 为2r = b − ab

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