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【单选题】
干扰是( )。A.
需要实现控制的化工装备
B.
被控对象内要求保持设定值的工艺参数
C.
除操纵变量外，作用于被控对象引起被控变量变化的因素
D.
受控制器操纵的，用以克服干扰的影响，使被控变量保持设定值的物料量或能量
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