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在mssql分组查询一组区间内的断号区间的sql语句

我在mssql中有下面这样一张数据库表,表格内容是这样的:
image
中间存在断号,我想通过写sql语句把中间的断号查出来,得到下列的结果,各位大神有什么好的方法,请指导一下,谢谢:
image


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