题目内容
若放大电路的A小于零，则接入的反馈一定是负反馈；若放大电路A的大于零，则接入的反馈一定是正反馈。
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The ______ opened the meeting by greeting the visitor from China.
The ______ was distributed to the participants ten days before the meeting.
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It is important to ask for if you do not understand what the problem is.
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