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共射电路中，基极与发射极之间的电压相位要看电路的工作状态和信号频率。在正常工作状态下，基极电压会滞后于发射极电压，通常相位差约为90度，这是因为基极-发射极之间存在反相放大。在不同频率下，相位差可能会有所变化。