1. 答案:错
  2. 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

  3. 答案:错

  4. 答案:对

  5. 答案:对

  6. 答案:对

  7. 答案:对

  8. 答案:对

  9. 答案:错

  10. 答案:对

  11. 答案:错

  12. 答案:对
  13. 如果函数在区域D内各点都可微分, 那么称这函数在D内可微分。(     )
  14. 二元函数的二重极限存在时,其两个累次极限可以不存在。
  15. 二元函数的全微分等于它的两个偏微分之和这件事称为二元函数的微分符合叠加原理。
  16. 集合的孤立点一定是集合的边界点。
  17. 存在既开又闭的数集。
  18. 高阶混合偏导数在偏导数连续的条件下也与求导的次序无关。
  19. 如果函数在区域D内各点都可微分, 那么称这函数在D内可微分。
  20. 下列方程中, (         )为欧拉方程。
  21. 下列微分方程是欧拉方程的是(       ) 。
  22. 只有周期函数才能展开成傅里叶级数。(      )
  23. 如果光滑闭曲线L所围成区域的面积为S,则S =(      )。
  24. 不存在由闭区间到圆周上的一对一连续对应。(     )
  25. 二元函数在一点不连续, 但其偏导数一定存在。(     )
  26. 若二元函数的两个累次极限存在,但不相等,则二重极限可能存在。(     )
  27. 若二元函数的两个累次极限与重极限都存在,则三者必相等。(      )
  28. 函数沿其梯度方向的方向导数达到最大值, 且最大值为梯度的模。(     )
  29. 函数在某点的方向导数存在, 则函数在此点的偏导数存在。(      )
  30. 设函数u=xyz在点(1,1,2)的某邻域内可微分, 则函数u在点(1,1,1)处的梯度为(      )。
  31. 函数的所有间断点是(      )。
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