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【单选题】
冲激不变法，也称脉冲响应不变法，是根据离散脉冲传递函数和连续传递函数的______________在采样瞬间相等的原则，建立D(z)和D(s)的等效关系的。
A.
阶跃响应
B.
速度响应
C.
脉冲响应
D.
加速度响应
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