For selectivity, there should be evidence that the substance being quantified is the intended analyte.
对选择性，应有凭证证明经定量的物质是目标分析物。
The experimental results show that the method is efficient for selectivity estimation for the distance joins.
实验结果证明该种方法能够有效地进行距离连接选择度估计。
Since there are strong local adjacent FM signals on 89.9 and 90.1 MHz, 90.0 MHz is an ideal even channel for selectivity testing.
由于有强大的本地毗邻调频90.1兆赫的信号就和89.9,90.0兆赫，甚至是一个理想的通道选择性测试。
This information can then be included as part of the optimizer decision during costing for selectivity and cardinality estimates for qualified queries which do not need to reference the view directly.
然后，这些信息被包括进来，用于帮助优化器在为那些符合条件的查询(这些查询不需要直接引用视图)的选择性估计和基数估计计算成本时做决定。
However, in the absence of data distribution information, the optimizer will calculate selectivity for filters of different types based on table indexes.
然而在缺乏数据分布信息的情况下，优化器将基于表索引计算不同类型筛选器的选择性。
And all ion channels are selective for a single type of ion, and we can think about how that selectivity takes place, and that's where this idea of atomic radius is going to become very important.
所有的离子通道都是仅对某一种离子具有选择性的，而我们可以来想一想这种选择性是如何发生的，这也就是原子半径这个概念将会变得，非常重要的地方。
The optimizer USES data distribution information generated by UPDATE STATISTICS to calculate selectivity for the filters in the query.
优化器使用UPDATESTATISTICS所生成的数据分布信息来计算查询中筛选器的选择性。
Refer to Chapter 10 of the Performance Guide for the detailed table that the optimizer USES to calculate selectivity in the absence of data distribution.
关于在缺乏数据分布的情况下，优化器用以计算选择性的详细表，请参阅performanceGuide的第10章。
If the data is skewed on the columns, for example if the majority of the data has a city name of Singapore, then the current selectivity could be greatly overestimated.
如果列上的数据有偏离，假设大多数城市名为Singapore，那么当前的选择性可能会被大大高估。
The optimizer can use data distributions to calculate selectivity for the filters in a query.
优化器可以使用数据分布来计算查询中过滤器的选择率。
However, in the absence of data distributions, the database server calculates selectivity for filters of different types based on table indexes.
但是，如果没有数据分布，则数据库服务器根据表索引计算不同类型的过滤器的选择率。
The optimizer can then compare the input variable values to catalog statistics and compute a better selectivity estimate for predicates.
然后，优化器可以将输入变量的值与编目统计进行比较，并为谓词计算出一个更好的选择估计。
In reality, the narrative is far more complex, and the implications far less sunny for students as well as colleges caught up in the cruel cycle of selectivity.
在现实中，叙事更为复杂，影响远不如对学生以及陷入了残酷的周期可达选择性高校阳光普照。
For the exceptional situations where the optimizer cannot choose an optimal query execution plan, DB2 has added features such as the SELECTIVITY clause and optimization guidelines.
对于优化器不能选择最佳查询执行计划的例外情况，DB 2已经增加了诸如selectivity子句和优化指南之类的特性。
Darwin's theory of the struggle for existence and the selectivity connected with it has by many people been cited as authorization of the encouragement of the spirit of competition.
达尔文的生存竞争以及与此相联系的选择理论已被许多人作为鼓励竞争精神的权威依据来引用。
For comparison, Figure 3 illustrates the access plan where I forced the DB2 optimizer to ignore the index by adding the clause SELECTIVITY 1 to the predicate in the where clause.
为了便于比较，图3显示了通过将SELECTIVITY1子句添加到where子句的谓词中，强迫db2优化器忽略索引的访问计划。
Consider, for example, the relative importance of standardized tests. The SAT or ACT scores of entering freshmen make up half of the important "student selectivity" score in the U.S. News formula.
以标准化测试重要性为例：《美国新闻》的计算公式中，入学新生的SAT或ACT成绩占生源质量一半的分数。
It 'shows a thousandfold selectivity for fluoride over other common anions.
它对氟离子的选择性比其它普通阴离子高几千倍。
They are collected for string columns only, and they are used by the query optimizer to improve the selectivity estimates for predicates of the type "column LIKE '% ABC'" and "column LIKE '% ABC %'".
它们仅针对字符串列进行收集，查询优化器用它们来提高“columnLIKE' %abc '”和“column LIKE ' % abc % '”类型谓词的选择性估计。
The cost parameters for membrane separation of gases are defined in terms of effective selectivity and cost permeability.
将膜分离过程的成本定义为成本渗透率和有效选择性的函数。
Compared with the routine and traditional medium used for separation and analysis, the outstanding character of MIPs based on molecular recognition is its excellent selectivity to the substrates.
与常规和传统的分离和分析介质相比，基于分子识别的分子印迹聚合物的突出特点是对被分离物或分析物具有高度的选择性。
Selectivity may be improved for some analytes by incorporation of separation steps prior to immunoassay.
在免疫测定前加入分离步骤，一些分析物的选择性可能会提高。
This proposed method has the advantage of high selectivity and sensitivity. It is suitable for on-line analysis.
本方法具有较高的选择性和灵敏度，样品处理方法简单快速，适合于实时在线分析。
The results show that such complex has good catalytic activity and selectivity for catalytic methanol carbonylation.
结果表明，该配合物催化甲醇羰基化反应具有较好的活性和选择性。
The thickness of OPPy film has an important effect on the sensitivity and selectivity for DA with respect to AA.
过氧化聚吡咯膜的膜厚对于多巴胺的选择性和灵敏度具有很重要的影响。
Patients scheduled for surgery should have preoperative testing ordered with selectivity and based only on a screening including a careful history and physical examination.
被安排手术的病人按照择期手术的要求进行术前检查，依照规定包括一个详细的病史和体格检查。
The selectivity index for height layer varies with seasons and stocking rate.
各高度草层的选择性随季节推移和放牧率不同而发生变化。
The pest is polyphagous, has obvious selectivity for hosts and good adaptability to tobacco.
该蝇系多食性害虫，对寄主作物有明显的选择性，对烟草有较强的适应性。
The pest is polyphagous, has obvious selectivity for hosts and good adaptability to tobacco.
该蝇系多食性害虫，对寄主作物有明显的选择性，对烟草有较强的适应性。
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