Check constraints are constraints on table columns that are used to restrict the user to a particular check condition.
检查限制是表的列上的限制，用于将用户限制到特定的检查条件。
In office calculation of closed traverse, the Angle of connection is not corrected, because there is no check condition.
在闭合导线内业计算中，由于连接角没有检核条件，因而对连接角未进行改正。
In office calculation of closed traverse, the Angle of connection is not corrected, because there is no check condition.
在闭合导线内业计算中，由于连接角没有检核条件，因而对连接角未进行改正。
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