例如，如果这两个本地谓词选择性没有优化器评估的强，怎么办？
For example, what if the two local predicates are not as selective as estimated by the optimizer?
即，通过连接谓词，CUST_INTEREST表的选择性非常强。
That is, table CUST_INTEREST could be very selective through the join predicate.
如果能将聚合操作或选择性非常强的谓词(即能过滤掉很多行的谓词)下推到CF，就可以获得最大的益处。
Being able to push down aggregation operations or very selective predicates to CF (i.e. those that filter out many rows) will result in the greatest benefit.
作为一水硬铝石的高效抑制剂，SA3还具有用量少、适用性强、选择性高等特点。
Being an effective depressant of diaspore, SA3 has such properties as lower dosage, good applicability and high selectivity.
用硬软酸碱理论和前线轨道理论解释了T -2K的高捕收能力和强选择性。
The high collecting strength and good selectivity of T-2K is explained using the theory of hard soft acid base and the theory of frontier molecular orbit.
这几种表面活性剂对煤浮选有良好的促进作用，具有捕收能力强、选择性高、节油明显等优点，有较好的应用前景。
The tests show that the surfactants have good behaviour in floatation, and have advantages, such as good collective power, high selectivity and saving oil , so they have good prospect.
强流脉冲电子束轰击可以实现316L不锈钢表层的选择性净化，表面织构化及表面快速钛合金化，从而提高不锈钢的耐蚀性。
The main results are summarized as follows:1, HCPEB bombardment induces the selective purification on the top surface of 316L stainless steel, surface texturation and rapid surface alloying with Ti.
H06具有选择性吸附力强、耐低温、化学稳定性优良等特点，对柿竹园矿石性质有很好的适应性。
The test results show that H06 has an excellent selectivity, fine chemical stability and not so sensitive to temperature, which it is suitable to the feed property of Shizhuyuan mine.
对该堵水剂的性能评价表明，它具有耐温、耐盐、吸附性强、选择性好的特点。
The performance evaluation results showed that the plugging agent had heat resistance, salt tolerance, strong adsorption, and better selectivity.
底物选择性实验结果表明，与结构相似的化合物相比，4 -氨基吡啶球形分子模板聚合物对4 -氨基吡啶显示出强的选择性。
The substrate selectivity of the polymer was investigated. The results showed that the imprinted polymer exhibited a high affinity for 4 aminopyridine among the tested compounds.
对金属-载体强相互作用的特性，产生的机理以及对多相催化反应的活性和选择性的影响进行了综述讨论。
In this paper, the properties and mechanism of strong metal-support interaction and its effect on the activity and selectivity in the heterogeneous catalytic reaction were reviewed.
专用光源的发射光谱与作物对光色的选择性吸收光谱相匹配，其针对性强、光效高，是给作物照明的最佳选择。
Its emission spectrum is marching with the crop absorbing spectrum, so it has good pertinence and high efficiency, and it is the best choice to light crops.
该方法选择性强，灵敏度高，可用于分析检测非法制剂中的醋酸泼尼松。
The method is selective and sensitive and can be used to detect the Prednisone Acetate mixed into drug.
近年来具有特别选择性、螯合离子能力强的高分子化合物的研究正与日俱增。
In recent years, the researches of some specific ion polymer compounds, which have the special selectivity, the strong chelating ability, are getting hotter and hotter.
结果表明，新型捕收剂BK- 330对黄铜矿捕收能力强，对黄铁矿捕收能力弱，具有较好的选择性。
It is concluded that the new collector BK-330 has stronger flotation power towards chalcopyrite than pyrite.
H06具有选择性吸附力强、耐低温、化学稳定性优良等特点，对柿竹园矿石性质有很好的适应性。
The test results show that H06 has an excellent selectivity, fine chemical stability and not so sensitive to temperature, which it is suitable to the feed property of...
H06具有选择性吸附力强、耐低温、化学稳定性优良等特点，对柿竹园矿石性质有很好的适应性。
The test results show that H06 has an excellent selectivity, fine chemical stability and not so sensitive to temperature, which it is suitable to the feed property of Shizhuyuan...
对该堵水剂的性能评价表明，它具有耐温、耐盐、吸附性强、 选择性好的特点。
The performance evaluation results showed that the plugging agent had heat resistance, salt tolerance, strong adsorption, and better selectivity.
结论：本方法选择性强、灵敏度高、处理方法简单，测定快速，可用于止咳平喘类中药制剂中非法添加茶碱的测定。
Conclusion: the method was specific, sensitive, operate easily and quickly, and could be used to determination the theophylline of Illegal Mixture in traditional Chinese medicines preparation.
方法具有分析速度快、样品用量少、 灵敏度高、 选择性强等特点。用于实际样品的分析，结果满意。
The method proposed has been used in the analysis of practical samples for bismuth with satisfactory results.
用该器件作为探头可用于各种环境的氢气检测及报警，具有选择性高、稳定性好、抗干扰、抗毒化能力强等特点，是各类氢气检测报警及用于便携式定量测氢仪的理想探头。
It may be used as probe for hydrogen detection and alarm and quantitative hydrogen measurement with such advantages as high selectivity, stability, anti-interference nature and anti-poisoning power.
试验结果表明，FD- 2型封堵剂的堵水率高，耐冲刷能力强，并可首先进入渗透率较大的井段，实现选择性堵水。
The results showed that the plugging agent had high water - plugging rate and good resistance to flushing. It plugged water selectively by entering the well stratum with high permeability first.
试验结果表明，FD- 2型封堵剂的堵水率高，耐冲刷能力强，并可首先进入渗透率较大的井段，实现选择性堵水。
The results showed that the plugging agent had high water - plugging rate and good resistance to flushing. It plugged water selectively by entering the well stratum with high permeability first.
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