【单选题】【消耗次数：1】
一个离散控制系统组成，不包括（ ）。
①
输入变量
②
状态变量
③
输出变量
④
干扰变量
参考答案：
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要对Application状态变量值修改之前应使用[填空1] 。
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某加热炉温度控制系统如图所示，则该系统的操纵变量是（），被控变量是（）
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