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单选题
某温度调节器PB=20%,测量范围为20~100℃,输出电流为0~10mA,若温度为50℃,输出为8mA,问温度为48℃时,输出为()(设为反作用式调节)。
A
2mA
B
4mA
C
5.5mA
D
9.25mA
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