更新1:
i would like to ask why its answer is Delta greater than or equal to 0.
i would like to ask why its answer is Delta greater than or equal to 0.
收錄日期: 2021-04-25 17:19:32
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20080326000051KK01935