Credit ratings range from a high AAA to a low d.
信用评级的范围从最高的AAA级到最低的D级。
Standard & Poors uses a very similar system, starting at AAA and ending at D, which indicates an issue in distress.
标准普尔使用大致相同的系统，从AAA到最后表示债券出问题的D。 。
Standard & Poors uses a very similar system, starting at AAA and ending at D, which indicates an issue in distress.
标准普尔使用大致相同的系统，从AAA到最后表示债券出问题的D。 。
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