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正确率:100%

下列对PLC软继电器的描述,正确的是( )。

  • A、

    只有2对常开和常闭触点供编程时使用

  • B、

    不同型号的PLC情况可能不一样

  • C、

    有无数对常开和常闭触点供编程时使用

  • D、

    以上说法都不正确

 参考答案:
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