送交者: 短江学者 于 2010-11-17, 17:32:58:

回答: 还可以。 由 cornbug 于 2010-11-17, 17:19:05:

• most relevant sentences: - 短江学者 (584 bytes) 2010-11-17, 17:39:08 (515423)
  • So the first order of derivative is enough. - cornbug (340 bytes) 2010-11-17, 18:00:08 (515428)

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