单项选择题

Credit migration risk is best described as the risk that a bond (‘s):

A．yield spread may increase.
B．creditworthiness may decline.
C．issuer is unable to make interest and principal payments on a timely basis.
D．空

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A．对
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内毒素的主要成分为（）
A、肽聚糖
B、脂多糖
C、磷壁酸
D、鞭毛