题目内容：
在系统的开环传递函数中增加一个比例微分环节，通常可使根轨迹向（）移动或弯曲。
A.右方
B.左方
C.实轴
D.虚轴
参考答案：
选择题：在系统的开环传递函数中增加一个比例微分环节，通常可使根轨迹向（）移动或弯曲。
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