【单选题】【消耗次数：1】
为使集成运放工作在线性区，电路中应引入
①
正反馈
②
电压反馈
③
电流反馈
④
负反馈
参考答案：
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相关题目
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【单选题】
下列哪种方式是幼儿老师与家长谈话交往时较好的方式（ ）。
①
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谈话时不涉及别的孩子，以平等的身份采用日常用语与家长交谈
②
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只是向家长报告孩子的优点，让家长高兴
③
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对存在问题的孩子，向家长指出他们的教育观有问题
④
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只是向家长谈幼儿的问题，要家长注意或配合教育孩子
【单选题】
阳光中的紫外线照射到皮肤上可生成( )。
①
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②
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③
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④
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