Aim Take the Loess Plateau for an example to explore the influence of the policy change about population and land in Shunzhi age of Qing dynasty, and offer an referential experience for present time.
目的以黄土高原为例，探讨清初顺治时期人地政策的变化调整以及对黄土高原的影响，为现代人地关系的改善提供借鉴。
Aiming at the potential problems of the referential value of speed change lane in current norms of China, the comparative research on norms at home and overseas is carried out.
针对我国现行规范中变速车道参考值所存在的问题，对比国外规范进行研究。
Referential integrity is a system of rules that ensure relationships between rows in related tables are valid and that you do not accidentally delete or change related data.
引用完整性是一种规则体系，这些规则可确保相关表中各行间关系的有效性，并确保不会意外删除或更改相关的数据。
You can change the conditions under which referential integrity is enforced by editing the relationship's properties.
通过编辑关系的属性，可以更改强制引用完整性的条件。
You can change the conditions under which referential integrity is enforced by editing the relationship's properties.
通过编辑关系的属性，可以更改强制引用完整性的条件。
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