下图所示电路中A、B 两点间的等效电阻与电路中的RL相等，则RL为_____Ω。（ ）https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/2da97ecda91e4c1c94ee2b171d750030.jpeg
举一反三
- 下图电路ab端的等效电阻为____Ω（）<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/467e7c93e1bf491582e0a57566fa878e.png" > A: 1.2 B: 1 C: 2 D: 0.4
- 图示电路中，A、B 两端间的等效电阻与电阻 RL 相等，则RL 为http://image.zhihuishu.com/zhs/onlineexam/ueditor/201803/a5e1942297b849a98b4799dadc56568c.png
- 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
- 下图电路中，Is=0时，I=2A，则当Is=8A时，I为___ 安。（ ）https://image.zhihuishu.com/zhs/doctrans/docx2html/201911/f2adbf969c284ffc943a62379d1f8f99.jpeg
- 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)