在串联反馈稳压电路中，比较放大电路的作用是将（）送来的电压和基准电压进行比较放大后，再送去控制调整管，以稳定输出电压。
参考答案：取样电路
—Your bedroom is so dirty. Would you please _______, Peter?
—OK, mum. I'll do it right away. [ ]
A. set it up
B. put it on
C. pick it up
D. clean it up
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