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【单选题】
在图示方波发生器中，已知A为理想运算放大器，其输出电压的两个极限值为【图片】12V；稳压二极管的正向导通电压均为0.7V。在不同情况下将得到下列不同的测试结果，选择正确答案填入空内：1．正常工作时，输出电压峰-峰值为（ ）， A、4.6V B、6V C、12V2．稳压反时，输出电压峰-峰值为（ ）； A、2.8V B、4.2V C、8.1V3．R2短路时，输出电压峰-峰值为（ ）； A、0V B、6V C、12V【图片】A.
B C
B.
A C
C.
B A
D.
C A B
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