dx 是變量還是一個特定的模型? 請展開闡述, 要簡明扼要.
所有跟帖:
• 不回答了. 怕說不好, 在這裏丟人顯眼. -expectingMM- ♀ (0 bytes) () 11/12/2012 postreply 21:06:05
• 不回答了. 怕說不好, 在這裏丟人顯眼. -expectingMM- ♀ (0 bytes) () 11/12/2012 postreply 21:06:05
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