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- Theoretical analysis, simulation experiment and engineering exploration are adopted to study the impact of the location of primary key stratum (PKS) on the evolution range of water flowing fracture. 摘要采用理论分析、模拟实验和工程探测等方法，就覆岩主关键层位置对导水裂隙带高度的影响进行深入研究。
- STUDY ON INFLUENCES OF PRIMARY KEY STRATUM ON SURFACE DYNAMIC SUBSIDENCE 覆岩主关键层对地表下沉动态的影响研究
- primary key strata 主关键层
- primary key stratum(PSK) 主关键层
- A table can have only one primary key. 一个表只能有一个主键。
- Primary key - foreign key relationships. 主键-外键关系。
- By use of FLAC, the mining model of a working face in some mine was built and the dynamic change process of load on key strata before primary broken during mining was researched. 摘要利用FLAC数值模拟软件建立矿区具体工作面的开采模型，模拟研究了随着煤层的开采关键层初次破断前载荷的动态变化过程。
- Primary key values must be unique. 主键值必须是唯一的。
- The customer ID field is the primary key. 客户ID字段是主键。
- The primary key consists of emp_id and cust_id. 主键包括emp_id和cust_id。
- The primary key value can't be edited in the form. 无法在表单中编辑主键值。
- Add or drop PRIMARY KEY or UNIQUE constraints. 添加或删除PRIMARY KEY或UNIQUE约束。
- Click the row selector for the current primary key. 单击当前主键的行选择器。
- The table does not have a primary key. 该表没有主键。
- Column is the primary key column. 列是主键列。
- Note: The primary key field is numeric by default. 注意：主键字段默认为数值型。
- Cantilever beam of key strata breaks and caves into blocks,which is periodic weighting of mining face. 关键层悬臂梁破断垮落成承压砌块,其垮落及沿架后切落,形成工作面周期来压。
- The mechanical model of key strata supported by coal pillar is set up according to the layout of coal pillars in the coalface of short wall mining. 根据短壁开采条件下保护煤柱的布设特点,建立由保护煤柱支承的关键层力学分析模型。
- The results show that the key strata control the emergence, development and space-time distribution of the overburden bed separations and fractures. 结果证明：覆岩关键层对离层及裂隙的产生、发展与时空分布起控制作用。
- The idea of key stratum pressure is put forward, and the ground pressure is mainly influenced by the breakage of key . 提出主关键层来压的新概念,指出回采工作面矿压显现程度主要受主关键层破断的影响。
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries
