圆和

In the collembolan community, Sinella, Onychiurus, Isotomurus are the dominance species, the frequencies are 37.26%, 31.6%,and 21.23%, respectively.2.In the agricultural ecology of Fuyang, the dominant species are Collembola and Acari. Their frequencies are 66.37% and 16.72%, respectively. Liposcelididae, Ceratopogonidae, Chironomidae, Staphylinidae, Nematoda, Enchytraeidae are common species.

弹尾目昆虫对重金属污染的反应，不同的种之间有很大的差别，其中，裸长角属对Cu污染反应不灵敏，陷等属、棘属对Cu污染反应敏感，随着污染程度的加剧，它们的数量明显减少；小等属和长属对Cu、Zn、Cd、Pb等重金属元素的复合污染反应很敏感，而裔符属、球圆属、土属、圆属和鳞长属对重金属复合污染反应很迟钝，在这些重金属复合污染严重的农田中仍能很好地生存繁衍。

In the CVB-PIV system,the image of astatic particle reflection is a circle,whose center represents the in-plane position of the particle andradius is equal to the displacement of bias related to the out-plane position of the particle.

同时，通过CVB-PIV对单个或多个粒子的静止、直线运动、摆动和圆周运动的研究，以及对平面镜角速度等参数对于粒子影像的影响和粒子面外位置与粒子影像偏移量对应关系的探讨表明，静止粒子的影像是一个圆，圆心坐标与粒子的面内位置相对应，圆的半径就是粒子影像的偏移量，与粒子的面外位置一一对应。

Firstly, the condensation heat transfer of steam-air mixture on the outside of a horizontal smooth tube and four square thread tubes is studied experimentally, and then, the condensation heat transfer on axisymmetrical surfaces as well as vertical plates of any kind of vapors containing noncondensable gases is analyzed theoretically.

本文作者先实验研究含空气的水蒸汽管外冷凝时水平光滑圆管和强化换热圆管的传热特性，实验时控制主流混合气体的压力和空气的质量成分，并探讨建立实验关联式的方法；然后对含不凝气体的蒸气在竖直平板和轴对称壁面上冷凝换热进行理论分析。

The factory possesses abundant technical personnel, complete equipment and consummate technology. It specializes in manufacturing of diamond cubic boron nitride grinding wheel with various specifications and the products include diamond resinoid bonded grinding wheel, CBN resinoid bonded grinding wheel, diamond electroplated grinding wheel, diamond bronze grinding wheel, diamond paste, diamond grinding head and tungsten steel lathe tool used for machining of various metals.

我厂技术力量雄厚，设备齐全，工艺精湛，专门生产各种规格的金刚石，立方氮化硼砂轮，产品包括金刚石树脂砂轮，CBN树脂砂轮，金刚石电镀砂轮，金刚石青铜砂轮，金刚石研磨膏，金刚石磨头，和加工各种金属的钨钢车刀http：//www.86wheels.com 磨削是目前半精加工和精加工的主要加工方法之一，砂轮则是磨削加工中重要磨具，砂轮一般安装在平面磨床、外圆磨床和内圆磨床上使用，也可安装在砂轮机磨刀机，万能磨刀机上刃磨刀具。

The conditions to measure accurately and the principles to select parameters of the multi— probes EST method are proposed, and the theoretical research, computer imitation and the experiment on a machine tool prove that these principles and suggestion are necessary and effective. The influence of the initial value errors of the probes, the installation error of the probes system, and the remaining error caused by the radical error motion are analyzed quantitively on the measurement accuracy of the multi—probes EST method. The influence of the error caused by the probe's axes which is not in a plane and the perpendicularity error of the plane which the probe's axes is in to the stational axis are discussed on the measurement results.

结合理论分析，对这些EST方法进行了计算机仿真分析和研究，重点研究了这些方法的应用条件和误差分离精度，所得出的结论是：三测头法EST基本上能实现各项误差的完全分离，适于在位测量使用；二测头法在恰当地选择测头安装角的条件下，可以得到较高测量精度，适于大型零件圆度、圆柱度、径向圆跳动和全跳动的在位测量；对置两测头时域法可以在一定程度上改善单测头法测量精度，但对随机径向误差无能为力；对置两测头频域法存在严重的谐波损失。

On the first day, when, getting up early in the morning, he came out of the shed into the dawn, and saw the cupolas and the crosses of the New Monastery of the Virgin, all still in darkness, saw the hoar frost on the long grass, saw the slopes of the Sparrow Hills and the wood-clad banks of the encircling river vanishing into the purple distance, when he felt the contact of the fresh air and heard the sounds of the rooks crying out of Moscow across the fields, and when flashes of light suddenly gleamed out of the east and the sun's rim floated triumphantly up from behind a cloud, and cupolas and crosses and hoar frost and the horizon and the river were all sparkling in the glad light, Pierre felt a new feeling of joy and vigour in life such as he had never experienced before.

第一天，他一大早就起了床，走出棚子，头一眼就看见新圣母修道院开始还发暗的圆屋顶和十字架，看见覆盖着尘土的草上的寒露，看见麻雀山的丘陵，看见隐没在淡紫色远方的，长满了树木的，蜿蜒着的河岸，他觉得空气清新，沁人肺腑，可以听到从莫斯科飞越田野的乌鸦的啼叫声，一会儿，在东方天际边，突然喷射出万道霞光，一轮红日从云层里渐渐显露出来。于是，圆屋顶，十字架、露水、远方和那条小河——所有这一切都在阳光下闪烁，这时，皮埃尔感觉到一种从来都没有经历过的，全新的，生活的喜悦和力量。

Web rotary screen business card printing and membership card making use of nickel metal pellets, built-in screen scraping knife and automatic ink, scraping knife business card printing and membership card from making ink print on over to the Nano-imprint lithography drum supported substrate surface.

卷筒纸轮转丝网制卡和会员卡制作使用镍金属圆丝网印版、内置刮墨刀和自动供墨系统，刮墨刀将制卡和会员卡制作油墨从圆丝网版上转移到由压印滚筒支承的承印物表面。

According to the trimming-mechanism and the trimming-deformation process of the strip ,the trimming force and the driving power of rotary trimming shears are analyzed and calculated.

从剪切机理、板带的剪切变形过程，分析计算圆盘剪剪切力和传动功率，介绍了圆盘剪开口度调整装置，剪刃侧间隙调整机构和重叠量调整机构以及侧间隙和重叠量对剪边质量的影响

The commonly methods to adopt in roundness and sphericity assessment always have the property of complicate computation or are out of specification in national standards. Based on the advantages of Cumulative-Sum-Method, the paper proposes to compute the ideal circle and sphere, and assess roundness and sphericity.

针对圆度和球度误差评定中常用方法不符合国标定义或计算复杂的问题，根据普通累积法的优点，提出了运用普通累积法拟合理想国和球，进行圆度和球度的评定。

The study indicates that Geodrassus diguitusiformis Hu, 2001 should be transferred to the genus Trachelas; Clubiona heteroducta Zhang et Yin, 1998 and Clubiona xiningensis Hu, 2001 are synonymized with Clubiona gongi Zhang et al., 1997 and Clubiona neglecta O.P.

管巢蛛科、圆颚蛛科、光盔蛛科(圆颚蛛和光盔蛛以前是管巢蛛的一部分，后被分出)目前全球分别已知15属527种、75属831种和32属239种；中国以往记述分别为1属78种(另有3疑问种)、7属18种(另有3疑问种)、和4属19种。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐