• 2022-06-19
    矩阵的非零特征值是( )
    A: 1
    B: 2
    C: 4
    D: 3
  • D

    举一反三

    内容

    • 0

      下列化合物中,不属于芳香杂环化合物的是( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/a024e8d480fb4118a97ea91ba159a3cf.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/72e704ca592d436fa897071fb9261b8d.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/7b7b51f20ff24a5798b3d77318b5d460.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/fb3c6ac56961413ea1eff2f9c8fad647.png" />

    • 1

      下列化合物中,能发生酰化反应的是( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/517de8a8f42942cf82859d6d49f675cf.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/6c8d89865ee24be78747d6fd25cd2d71.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/2483bc407db748cc96889b6112cbfb5c.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/cb06682ded43441d80d66a15e803c3b8.png" />

    • 2

      自然指数衰减函数e-at的拉氏变换为( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/8737eea8f9ab4b57956966b78c81457a.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/e2e3d66540944a6abef22331e994afd3.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/d1f05087cb5641e59f6be5245adf2af2.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/333ade86887d4e3aa44332086c758e09.png" />

    • 3

      下列结构中同时存在p–π 共轭和π-π共轭的是( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/7faee411338f4efbbda8ab1cdf1f3850.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/5284f4cbe3d24ff1b3f0aca9a2e99e74.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/48992f7f790a48809d635b65adef5b03.png" /> D: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/bb6d6eb8dcda434a8fa1646a9176368e.png" />

    • 4

      某时刻进程的资源使用情况如下表所示,<img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/21691db0015943d6b7e82451ed230996.png" />此时的安全序列是( )。 A: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/54b17f5e49fa4900a7ca6f50aedc8af4.png" /> B: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/a5ce7b0da26e4b608ebb5332681915bb.png" /> C: <img src="https://image.zhihuishu.com/zhs/doctrans/docx2html/202109/7c94f93470f44814a1e8ee30e9af9f76.png" /> D: 不存在