有效数

Effective cardinality is the number of rows that are selected from a base table.

有效的行集数是从一个基表查询的行数。

Day, as I have just graduated rent someone else's old house, the kitchen store where there are many antique landlord can not move, so I used a simple but very practical approach, persist in a few days is very effective, that is, you can not find an empty yogurt bottles, which pour some sugar water and placed ant infested areas.

一天，我刚毕业租别人的老房子，厨房商店那里有许多古董业主不能移动，所以我用一个简单但很实用的方法，坚持数天是非常有效的，也就是说，你无法找到一个空的酸奶瓶，其中糖倒入一些水，放在蚂蚁出没的地区。

Through an analysis on mud-clogging mechanism of suction nozzles on wet type sweeper, a concept is suggested, that water ratio in dust nearing the wall of suction nozzle duct should be decreased so the mud stickiness can be controlled under a critical value and not sticking to the duct wall whereas water ratio in central dust passage of the duct is properly increased to satisfy effective dust absorbing. On the basis of the concept, a water spraying device is designed with improvement for suction nozzles. In the device, the water hole numbers, diameters and distribution along the nozzle circumference as well as initial direction of water spraying are all determined according to concrete suction nozzle structures.

通过对湿扫型道路清扫车的吸嘴易被泥土堵塞的机理分析，提出降低吸嘴流道近壁的尘土的含水率，控制泥块的黏性处于临界黏性以下，使泥块不黏附于流道壁面；而将吸嘴流道中心部位的尘土的含水率适当加大，以满足有效压尘的解决思路，并根据这种思路改进设计了一种吸嘴喷水装置，按不同吸嘴的具体结构确定孔数、孔径、孔沿圆周的分布规律和喷水的初始方向等要素。

Zhang Min:"TrumpJet" technology sets the dosing point of wet end chemical additives at the outlet pipe of machine screen of the head-box, and uses Booster pump to extract stock as dilution media, and uses "TrumpJet" mixing to inject chemical additives into Headbox loop, which dexterously uses energy of stock in Headbox pipelines, making a very low power consumption in Booster pump (only requires the energy of speeding up for chemical additives flow), eliminating large volume of chemical additives for fresh water dilution, and chemical additives and stock can be fully mixed within 2 seconds, and delivered to model for shaping at the maximum of chemical additives efficiency.

在数千年的造纸发展史上，传统的湿部化学品的加入和混合一直是利用加后稀释水的方法通过静态在线混合器来完成的，由于湿部化学品的加入量很小，，其流量仅为 0.1~1升/秒甚至更小，而要将如此之小的流量加入到纸机流浆箱300 ~2000 升/秒的工艺系统浆料流体中，同时达到化学品与造纸纤维均匀接触，即使是消耗大量的清水和使用在线混合器也很难达到&完全&且&有效&地混合，于是就又产生了将化学品的加入点，提前到远离流浆箱的工艺位置，这样可以延长混合时间，但人们忽略了在过早加入化学品的同时也带来了化学品的流失、化学品在短循环系统循环产生有害副产物生成浆管悬挂、化学品水解失效等一系列弊病。

The data of polymorphism information contents, effective number of alleles and heterozygosity indicated that, the genetic variation of Small-tailed Han sheep was the highest, Mongoha sheep was the second, Lanzhou large tailed sheep was the third, Tibet sheep was the fourth, Poll Dorset sheep was the lowest.

多态信息含量、有效等位基因数及群体杂合度数据表明，小尾寒羊遗传变异最大，其次是蒙古羊、兰州大尾羊、藏羊，无角道赛特变异最小。

The results of the study showed that:① Using dozens of kilograms of explosives the signal can be detected at distances up to 200 km;②Active source has a certain degree of repeatability among different shots;③This paper presents the following shooting mode and signal detection method based on the similarity of different shots: In light of the similarity between the signals of big shot and small shot, this paper presents a cross-correlation method using signal from big shot signal with high SNR and small shot signal to detect weak small shot signal, the method can effectively detect the small shot signal and pick up the start time of phase, this method can help us make full use of past seismic exploration data records.

野外实验采用1次大当量激发和16次小当量激发，研究结果表明：①有可能利用数十公斤当量的炸药实现200km距离的探测；②在激发条件相同时，不同当量的激发波形滤波后存在一定的相似性；③依据人工震源可重复性采用以下的激发组合方式和处理方法能够有效提高信噪比：针对大当量激发与小当量激发波形的相似性，利用大当量激发的波形作模板与小当量激发的波形作相关，可判断台站是否接受到小当量激发的信号并检测其震相到时信息。

In addition, he helped teachers form a self-initiative English teaching team and authorized them the rights to construct their own teaching materials and strategies which must be well-integrated and appealing to students' interests and diverse English proficiency levels among students.

二、 能提出有效解决英语教学困境的策略，如甄聘英语专任教师，为一般导师办理英语研习营，支援英语教师间的协同研究，以解决英语师资短缺问题；强调新旧教材衔接，增加英语教学节数，英语教学专任化，以提升英语教学成效。

Yield components showed that number of effective pods per hectare was more important than 1000 seeds weight and number of seed per pod.

3随密度和施氮量增加，单位面积有效角果数呈先增后减的趋势。千粒重与施氮量关系密切，但过量施氮则降低千粒重。

Results: The total samples were 199 patients; the numbers of patients before and after the intensivist care implementation were 71 and 128, respectively.

结果：有效样本数为199人，专责重症专科医师实施前之患者数分别为71人及128人。

By appropriately adjusting the optical attenuators, the phase shift between two adjacent channels is achieved, thus 8-channel optical quantizer is realized with resolution of 4 bits.

实验中对10 GHz的正弦信号进行了光量化测试，量化结果的有效比特数为3.7 bits，仅低于理想分辨率0.3 bits。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。