题目内容
在用三菱变频器和PLC进行电机七段速调节过程中，若要变频器工作在P25参数对应的频率下，则应将下列（）端置为ON。
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在三菱变频器中，P3是工频频率。（ ）
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信源编码的主要功能之一是对数字信号进行( )
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