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1·Securitization of Financial Assets; Credit risk management; Credit Rating; Cedit Enhancement.

金融资产证券化；信用风险管理；信用评等；信用增强。

2·I decided to give all my CEdit-derived classes a common base class for any common methods they may need.

我决定写个通用基类，把任何常用的需要的方法放到基类里。