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大家好，我现在遇到一个很奇怪的问题，我现在有一个2.5V的电压，当我把这个电压的负极接到DSP板子上面的地时，正极接到ADCINA0这个因脚上，然后我再测量这个电压的正负极，电压值就变成了1.8V左右，我不是很理解，请大家不惜赐教，谢谢。
