坐标系{B}相对于坐标系{A}绕Z轴旋转<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/0e7f1303cace4a9fa888211d1b94e3c3.png" />度，坐标系{B}中的矢量<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/06f5b17a51fb43deb2e94fe685b5b511.png" />在{A}中的坐标表示为（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/86783ba498314fdfa0c22abffc2891f2.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/ea644ea443b74b54b41c89eff9db781a.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/dddcfd36e178435c8a82f63cc982fd2b.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/1d5f3187c48f447eb117b0005e7ca646.png" />

JK触发器的特性方程是（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/9dfa6d2bcd9d459ca40130783da2454a.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/1b99630eead9460aa41cd8b7e0a19594.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/5868e29bb93b4f9eb7adc83586f47786.png" />

一阶系统的时间常数为T，其单位斜坡响应为（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/67e3c0d52e254647b240f082770206ce.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/77cbfaa7e7c347c9a502d35f1a8b3f5c.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/52b5ceec9ed54c339da07e37bc70083e.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/698f17a321984af99eeee8732000c80d.png" />

下列重氮离子进行偶联反应，哪个活性最大？（ ） A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/971f9e07d154479180dc4b963ca9f331.png"> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/9bd8814746a84f9c81f49eefa5104a05.png"> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/936cd022f8df4a38abe5e1adaa8e97ad.png"> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/42005484f8fb4b1eac7615c0f6a9d46d.png">

<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/9f9406486e5a4813a7539fcb052a80e8.png" />22、在图（a）和（b）中各有一半径相同的圆形回路L1、L2，圆周内有电流I1、I2，其分布相同，且均在真空中，但在（b）图中L2回路外有电流I3，P1、P2为两圆形回路上的对应点，则（ ）。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/fb1bfdb2e7a84638946bc957456f3b67.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/b91120ff6bb34d3bbec3fcc609f970f5.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/fb1bfdb2e7a84638946bc957456f3b67.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/7aa75d62a74f43ffaa7ac69a9e36ab7b.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/1153c3c855c4410791ec82e928b347fd.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/7aa75d62a74f43ffaa7ac69a9e36ab7b.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/1153c3c855c4410791ec82e928b347fd.png" />，<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/b91120ff6bb34d3bbec3fcc609f970f5.png" />