加在一个感抗是20Ω的纯电感两端的电压是
V，则通过它的电流瞬时值为（）
A:
B:
C:
D:
V，则通过它的电流瞬时值为（）A:
B:
C:
D:
举一反三
- 通过点<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/a13927df1bf542dfa036a32b10364f69.png" />的拉格朗日插值基函数<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/65695a42c7a14b649b6aa4fb68f7e499.png" />满足( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />＝1，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />＝1，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />＝0，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/7769611ac5cd4c93975be7c41a49ae71.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/99af333f3e934ef6a75022ee1e728b53.png" />=0，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/f80e8e400f3f4916bcaf6b5fde757f16.png" />
- 在下列的HTML中，哪个可以产生超链接？ A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/a9bcf63958144ed794c2429877db052a.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/5f5d626c8bba4c9486c2455dc0f20be5.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/3a165307757a4da5b4e34381b1fe8cf5.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/334e855f187b4c2684d73890e18d5988.png" />
- 中性水溶液是指（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/9bef71113e73499f9f3d9f877a0d07f3.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/315534da2fa24656b8ac34316eb43211.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/0f25c8c53d964d3290ee60bab0aa7fe7.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/0e9eca0e483743c787605572ed065b97.png" />
- 设系统的初始条件为零，其微分方程为：<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/9c4c212cc1594dd19dcfc992512ba0e1.png" />，则_____。() A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/3f8dd968db6e49f5a261281ea5f038bc.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/a73ceb98e53043eb9817c3014694d0b3.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/cfbf541fa5504f819df5429a3c181a0d.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/404ca95df5b34ade860d159893fbb0e2.png" />
- （ ）属于变形工具组 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/5c560845dbf2422c87ee3a5e67f68690.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/ba8211e54394467084e55d8c039638f3.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/8abd259feec748b6818447a3039e4b70.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202009/3b82f4425c304802b45be795ab5bf7bf.png" />