题目内容
单管共集电极放大电路中，若输入电压为正弦波，用示波器观察vo和vi的波形，则vo和vi的相位相差180o。
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系统受力图中的内力可不画，但是该对内力对于单体受力图必须要画，且反向、共线的关系必须体现出来
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