在图题所示放大电路中，集电极电阻Rc的作用是（）
A: 调节静态基极电流
B: 电流放大
C: 调节静态集电极电流
D: 防止输出信号交流对地短路，把放大了的电流转换称电压
A: 调节静态基极电流
B: 电流放大
C: 调节静态集电极电流
D: 防止输出信号交流对地短路，把放大了的电流转换称电压
举一反三
- 在图所示放大电路中，若上偏置电阻<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/9758255bae2247f0adca45b395affc88.png" >短路，则该电路中的三极管处于（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/c5bf1e05d62143c89218a62d2e9a7678.png" > A: 状态不定 B: 饱和状态 C: 截止状态 D: 放大状态
- 设随机变量X~N(4,2)，则其特征函数为(). A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/357ad388efa144a1a2b824e2b1ded239.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/d52e72841a81484981168cbb693bad24.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/00e1e0c2bba04889b58eb483c88821fb.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/1851c30670244a5c821128d6c44a3ecc.png" >
- 为使锅垢中难溶于酸的CaSO4转化为易溶于酸的CaCO3，常用Na2CO3处理，反应式为CaSO4+CO32-<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/88320eab77594b6abf0039ab0efe3c57.png" />CaCO3+SO42-，此反应的标准平衡常数为（）。 A: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)·K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3) B: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)/K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4) C: [K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)·K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)]1/2 D: K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaSO4)/K<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/e8c371ce6b96487e829331bb8dee134f.png" />(CaCO3)
- 在图题所示放大电路中，集电极电阻Rc的作用是（）[img=303x216]17d6050cb33dc5f.png[/img] 未知类型：{'options': ['调节静态基极电流', '电流放大', '调节静态集电极电流[img=74x96]17d6050cc75062b.png[/img]', '防止输出信号交流对地短路，把放大了的电流转换称电压'], 'type': 102}
- 10人中至少有2人同生日的概率是多少？（1年按365天计算）() A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/f3b577db2dd0429b9eab51dff5644b23.png" > B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/6f30552128e14bfb89b26b30ac2b72db.png" > C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/fa8f9ba9bd2d4a40b7d007fd9e9988fd.png" > D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/05a12b5d4da04e2c9ea779b313981c83.png" >