It is common for relational databases to use the concept of primary keys, generated by an auto-increment feature or by a sequence generator.

在关系数据库中通常可以使用主键，它由一个自动递增特性或序列生成器生成。

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And we find that cost increment between different contract modes is the key point to keep relational contract's self-enforcing feature.

证明在不同合同模式之间的服务商成本增量是保持关系合同自执行特性的关键因素。

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This paper analyzed the feature of pure hydraulic turbine speed adjustment and presents a mathematical model during the turbine speed increment.

分析了汽轮机纯液压调速系统的特点，建立了汽轮机升速阶段的数学模型。

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This paper analyzed the feature of pure hydraulic turbine speed adjustment and presents a mathematical model during the turbine speed increment.

分析了汽轮机纯液压调速系统的特点，建立了汽轮机升速阶段的数学模型。

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