This step requires a default service class, for which messages of unknown priority type can be assigned.

此步骤需要一个缺省服务分类，用于分配未知优先级类型的消息。

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Work items are sorted by rank, priority, type, and ID.

工作项目会依照顺位、优先权、类型和ID排序。

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Work items are sorted by rank, priority, type, and ID.

工作项目会依照顺位、优先权、类型和ID排序。

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