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【简答题】
图10．2．7(a)所示的为一多谐振荡器，555定时器的内部结构原理图如图10．2．7(b)所示。已知R2=R1／3，求： (1)对应画出稳态时vC(t)及vO(t)的波形； (2)计算振荡周期T。
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