As the primary cost of security transaction , the floatation of trading commission would change the microstructure of security market 证券交易佣金作为证券市场制度中交易费用最直接的体现，其变动必然带来证券市场的微观变化。
2.
The proposals of bigger temperature difference with lower water flow rate and variable primary water flow rate were introduced to reduce the operation cost or primary cost of chilled water system 摘要详细分析了大温差小流量系统方案和一次泵变流量系统方案在空调水系统节能方面的异同。
3.
When a query on the relational views is issued , it is repeatedly rewritten using the rules . this process generates number of navigation plans to compute the query ; the cost of these plans is then estimated based on a simple cost model that takes network accesses as the primary cost parameter . in this way , an efficient execution plan is selected for processing the query 当根据关系视图发出一个查询时，它被重复的使用重写规则来重写，这个过程产生大量的导航方案来运算查询。这些方案的代价是根据代价模型来评估的。代价模型是用网络访问作为原始的代价参数。
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