• 2022-05-26
    如果SSE表示多元线性回归模型的回归离差平方和,SSR表示残差平方和,SST表示总误差平方和。下面的表述哪个是正确的?
    A:
    B:
    C:
    D:
  • C

    举一反三

    内容

    • 0

      关于斜弯曲的主要特征有四种答案,试判断哪一种是正确的。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/42375925fb1245cebbfabe4a5cde4d5a.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/6055f7367a0b466581761cb41cf73e10.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/a028bfcdbbcc4cb592fb6cd9d78b736a.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/6abdbfbb54644603b4269b938e091af5.png" />

    • 1

      空心圆轴的外径为D,内径为d, α=d/D。其抗扭截面系数为( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/a4529f25a3514c4fb3fb60740f65c915.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/ed201b86c65c4e91be69e526278e5396.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/997a80bcc1dd4cbd9aacbdc8724ccaf9.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/c3e0ca0958684b89bce9d01917a38b5a.png" />

    • 2

      下列化合物有旋光性的是( )。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/42754375451947b4a2097a204914e285.png" border="0" vspace="0" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/259cc0f9369441888e4306c19039152f.png" border="0" vspace="0" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/c6798f5eb7e14df7a79f40cdd7d2f42e.png" border="0" vspace="0" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/4275928f484d4bad94705297fe159cf0.png" border="0" vspace="0" />

    • 3

      电影、电视剧中常常可以看到古琴,但也存在很多错误的古琴摆放方式,以下图片中,正确的古琴摆放图片为?( ) A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/72ff75fe949c44d796405ab3b88eda07.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/970629500bbc4f089bad19c3045e45f7.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/23f7b6b2c04048a990fcd07653bf9217.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/bed0c78e85c846e0aa005eccfe612c80.png" />

    • 4

      图示螺钉在拉力F作用下。已知材料的剪切许用应力&#91;τ&#93;和拉伸许用应力&#91;σ&#93;之间的关系为:&#91;τ&#93;=0.6&#91;σ&#93;。试求螺钉直径d与钉头高度h的合理比值。<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/ea5aac2943c148f0898270443ef13de6.png" /> A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/aa9810483bad40828ce87767240d1292.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/020a3681565242b99d12bf523efb96ad.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/337cbe73f1c7414b888c54365465b39d.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/eb5408a49bfd47db91aaf04e7780d90c.png" />