This paper was focus on Dianshan River which is one of the most important water sources of Shanghai. We study the distribution, speciation and transformation rule of Cu, Cd, Cr, Hg, Pb and As in sedimentary record. In addition, the history of development of industries and agriculture were also taken into account to study the heavy metal pollution history in the study area.

本文以上海的重要水源地——淀山湖為研究對象国产一区二区三区在线视频，通過對研究區(qū)沉積物中重金屬元素Cu、Cd99日韩精品、Cr、Hg91成a人片在线观看无码、Pb影视大全高清版官网在线观看、As的時空分布規(guī)律以及它們在沉積物中隨時間或沉積深度的形態(tài)分布及遷移轉化規(guī)律的研究，綜合考慮區(qū)域工農業(yè)發(fā)展現狀和歷史對沉積物中重金屬元素含量及分布的影響粗暴大黑鳮巴视频欧美中文，對區(qū)域重金屬污染歷史及效應進行分析論證性交欧美三级在线。

The relationship between the negative binomial distribution and the time-dependent Poisson distribution was further discussed.

并進一步闡明了負二項分布與時依Poisson分布的關系。

A theoretical distribution that is a good approximation to the binomial distribution when the probability is small and the number of trials is large.

當概率小而試驗次數大時逼近二項式分布的一個理論分布色色社区五月。

Through a probability problem,a connection is showed between binomial distribution and negative binomial distribution and therefore a composed formula is set up,which is proved by way of probability and algebra.

通過一個概率問題A级国产精品片在线观看，給出二項分布與負二項分布的一種聯系，從而建立一個組合公式亚欧大尺度无码视频在线观看，并由概率思維方式與代數方式給出證明

The magnetic field in the cell was calculated on the basis of Biot-Savart's law and improved—equal—effective—magnetic dipole method, and the computer program was much improved on previous work.

根據歐姆定律和基爾霍夫定律91手机最新国精品自产拍不卡，用有限差分法導出了求解鋁電解槽內三維電流分布的數學模型，編制了計算程序老外美女视频A片，在國內首次較準確地計算了鋁電解槽內三維電流分布1024手机看电影一区乳。

By the circular current symmetry characteristic,on the basis of Biot-Savart law,the expression of the whole-space magnetic induction intensity distribution was deduced in the spherical coordinates system.

在球坐標系中，由磁感應強度的計算公式畢奧-薩伐爾定律出發(fā)国内自拍区在线下载视频免费观看网址，利用圓電流磁場的對稱性推導出全空間磁感應強度B分布公式国产福利AV在线导航，討論了圓電流平面上和中心軸線上的磁場，應用C數值計算方法對全空間磁感應強度B公式求解亚洲综合在线五月婷婷，繪制出磁感應強度分布的主要區(qū)域及磁場的空間分布圖性色生活毛片免费无码观看，并對全空間磁感應強度B分布特點進行了討論。

Initially this region will be blank, note that the temperature distribution behaves qualitatively like the pressure distribution.

最初這一地區(qū)將會是空白国产,日韩,欧美一区在线，請注意溫度分布的所作所為定性一樣国产第一次破苞视频网站观看，壓力分布。

The remote sensing equation for determining the profiles of the atmospheric temperature structure constant and wind have been derived by using the statistical characteristics of the fluctuated atmospheric microwave radiation.

推導出利用大氣氧氣微波輻射起伏統計特征在线aA中文字幕，探測大氣溫度結構常數分布與風分布的遙感方程国产激情在线123。

Fractal dimension also reflects the impact of deposit energy distribution and diagenesis on the permeability distribution.

分維還能反映沉積能量分布和成巖作用對滲透率分布的影響。

Based on traffic properties analysis in highway network,this paper proposes an inferrence model of OD distribution of highway traffic according to entropy maximisation principle.Being able to infer thoroughly from the effective information and parts of data to update the OD matrix the model can simplify the method of acquisition of OD distribution without over- emphasizing the OD survey as before.

本文在分析公路網交通特性的基礎上午夜久久性爱一区，根據極大熵原理建立了公路交通量 OD 分布的推斷模型在限福利影院，該模型可充分利用各種有效信息和局部資料對 OD 分布情況進行推斷及追蹤校正，因而可避免嚴重依賴 OD 調查數據的狀況美女www片免费，使獲取 OD 分布資料的方法得以簡化亚洲鲁在视频在线观看。