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【单选题】
根据图示的反馈放大电路，试选择正确答案填空：1．若R7减小，则_______。(A、交流负反馈增强，B、交流负反馈减弱，C、不影响反馈深度， D、使静态工作点更加稳定)2．在正常放大条件下，若R4减小，则_______。(A、电压放大倍数增大， B、电压放大倍数减小， C、电压放大倍数变化不大)【图片】A.
AB
B.
AC
C.
CA
D.
AC
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