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我有个问题。我阅读了许多关于 CAP 定理的博客和网站。他们说单节点系统是 CA,但是如果该单节点出现故障,它怎么可能是“A”?因为如果是这样,系统将不可用,对吗?CAP 中的“可用性”是否等于分布式系统 HA 中的“可用性”?