1可续期债券评级方法目录一、研究背景.............................................................................................................2二、适用范围.............................................................................................................3三、评级思路与框架................................................................................................3三、评级要素分析.....................................................................................................4（一）发行主体长期信用水平....................................4（二）债券条款设置............................................4四、评级方法的局限性....................