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电压比较器lm393,参考电平设置问题

如电路图,参考电平设置在in+,则out端输出正常,能随Vin与Vref大小关系,对应高低电平转化,

如果参考电平设置在in-,则out端一直保持在低电平,设置在1IN-,1OUT一直在低电平,设置在2IN-,则2out一直在底电平。这是什么情况