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【单选题】
下列关于迟滞电压比较器的说法，不正确的是（ ）。A.
迟滞电压比较器有两个电压
B.
构成迟滞电压比较器的集成运算放大电路工作在线性区
C.
迟滞电压比较器一定外加正反馈
D.
迟滞电压比较器的输出电压只有两种可能
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