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问题：
[单选题]下列对PLC软继电器的描述，正确的是（ ）
A、有无数对常开和常闭触点供编程时使用
B、只有2对常开和常闭触点供编程时使用
C、不同型号的PLC的情况可能不一样
D、不同元件情况不一样
参考答案：
A
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