不利的一面，您发现PHP对于取样分布缺乏内在手段，而这是实现大多数统计测试所必需的。
On a negative note, you discovered that PHP has no native access to sampling distributions, which is a requirement for implementing most statistical tests.
SQS使用基于加权随机分布的消息取样，在查询消息时，它只从取样的一部分服务器返回消息。
SQS USES message sampling based on weighted random distribution, and it returns messages only from the sampled subset of servers when you query for messages.
根据竹螟幼虫分布的特点，确定了不同密度下的最适抽样数、序贯抽样的应用和调查取样方法。
The optimum sampling number, the sequential sampling application and the sampling method at different densities were determined based on the characteristics of the larva's distribution.
实验结果表明：元素分布的均匀度与元素本身的赋存状态及取样量有关。
Our experimental results reveal that the homogeneity of the studied elements is related to their speciation and sampling amount.
通过现场测试取样分析，首次确定了攀钢高炉的铁损走向与铁损分布的定量数据以及铁损的形态。
By on-the-spot testing and sample analysis, the quantitative data of core-loss trend and distribution of Pan Gang's NO.
采用大口径土钻对间作种植模式下冬小麦与春玉米根系进行取样，分析了两种作物根系的空间分布及动态变化规律。
In this paper, root samples of winter wheat and spring maize under intercropping were taken with large-bore soil auger, and the dynamics of their spatiotemporal distribution were studied.
该模型对磨屑破碎过程和分布的描述和预测基本不受测量仪器分辨率和取样长度的影响，因而比传统基于统计分析的模型更为合理和有效。
The multiple fractal model can describe and prognosticate the wear particles fragmentizing and distribution more reasonably and effectively than traditional models based on statistics.
本文通过最佳信号噪声比分析，讨论了单分子辐射单光子在具有时间均匀分布背景信号时对同步取样时间的选取。
We theoretically discussed the synchronization sample gate time determination by considering the optimal Signal-to-Noise Ratio (SNR) where the background showed time-uniformity distribution.
对某300MW燃煤电厂锅炉进行煤、渣、飞灰取样后，测定煤和燃烧产物中汞和砷的含量，研究了电除尘四个电场飞灰中汞与砷的分布特点。
Coal, slag and fly ashes were sampled from a 300 MW utility boiler. The concentration of mercury, arsenic in these samples and the particle size distribution of the fly ash were determined.
用丰脂灵化学采脂和常规采脂对广西派阳山林场的马尾松进行采脂试验，并取样测定木材树脂道的数量、大小与分布及木材明子化程度。
The methods of collecting resin with Rich resin panacea(RRP) and without RRP( normal way ) were used in the resin collecting experiment of Pinus massoniana Lamb, in Paiyangshan forest farm, Guangxi.
本文根据地下水取样的水质化验结果，本文对主要超标组分空间分布规律进行研究，结果表明，TDS与氯离子空间分布上呈现较好的相关性。
With the examination result, mainly exceeds component distribution rule shows that: TDS and in the chloride ion spatial distribution presents the good relevance.
通过仔细研究基础概率理论的柏松分布问题，能对取样理论作比较形象的、定量的理解。
Through profound study on Poisson-Distribution inthe theory of probability, the samplihg theory can be comprehended vividly andquantitatively.
除此之外，改变数据集的分布也是常用办法，本文采用的办法是过取样和欠取样。
It is more difficult way according to changing the structure of dataset directly which is a popular method.
除此之外，改变数据集的分布也是常用办法，本文采用的办法是过取样和欠取样。
It is more difficult way according to changing the structure of dataset directly which is a popular method.
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