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19. y. 0. x. 用哪种坐标？. 直角坐标. z = 0. 。. 。. 。. D xy :. b. D xy. a. z. y. x. 19. cz=xy. b. o. a. z. y. z = 0. x. 19. cz=xy. b. o. a. z. 19. y. cz=xy. . b. o. a. x. 20. y. x. 0. 用哪种坐标？. 柱面坐标. 。. 。. 。. 联立. D xy :. a. D xy. z. y. 0. x. 20. 柱面坐标.

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19.

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  1. 19. y 0 x 用哪种坐标？ 直角坐标 z = 0 。 。 。 Dxy: b Dxy a

  2. . z y x 19. cz=xy b o a

  3. . z y z = 0 x 19. cz=xy b o a

  4. . z 19. y cz=xy  b o a x .

  5. 20. y x 0 用哪种坐标？ 柱面坐标 。 。 。 联立 Dxy: a Dxy

  6. . z y 0 x 20. 柱面坐标 2a 联立 L a . 2a

  7. . z y 0 x 20. 柱面坐标 2a 联立 L a . D . . .

  8. 21. z 0 x y a b

  9. . z 0 x y 21. 问题： 1 用哪种坐标？ （球系） 2 要不要分块？ a 3 怎么分块？ b  把图形放大一些 把图形放大一些

  10. . z 0 x y 21. r =2acos 联立 r =b a 交线 L处 b . 交线 L

  11. . z 0 x y 21. z . a . b . . . . . x y

  12. . z 0 x y 21. . a I = I1+ I2 . b . . .

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