• 2022-07-25
    坐标系{B}相对于坐标系{A}绕Z轴旋转度,坐标系{B}中的矢量在{A}中的坐标表示为( )。
    A:
    B:
    C:
    D:
  • D

    举一反三

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    • 0

      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">

    • 1

      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" />

    • 2

      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" />

    • 3

      若某系统的传递函数为G(s)=<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/79eaf52d33de48cd9c870f2ce2ace2dc.png" />,则其频率特性的实部R(ω)是( ) A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/22de2385b19e4de8be5ae000bddad620.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/4a873e7d91b44c11bad767efd2747b11.png" /> C: -<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/4a873e7d91b44c11bad767efd2747b11.png" /> D: -<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/22de2385b19e4de8be5ae000bddad620.png" />

    • 4

      正弦电流通过电感元件时,下列关系中错误的是( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/8415ac5593634c5eaaad4a126350ec19.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/7a783db30af347f1a2078e09b73c3787.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/0108b3dcdc394e0f92f878b4f88ea786.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202102/7e784a23e8394962a973f26a27bcf4ba.png" /> E: UL=jXLI