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图（a）所示为方波发生器，已知A为理想运算放大器，其输出电压的最大值为12V；R1＝50kΩ；该电路输出电压uo和电容两端电压uc的波形如图（b）所示。则稳压管的稳压值Uz及电阻R2的阻值分别为（       ）。

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