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【单选题】
国际电工委员会(IEC)将电流信号（ ）和电压信号（ ）确定为过程控制系统中模拟信号的统一标准。A.
0~20mA(DC);0~5V(DC)
B.
4~20mA(DC);0~5V(DC)
C.
4~20mA(DC);1~5V(DC)
D.
0~20mA(DC);0~10V(DC)
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