等径的

At present, the retrofit options include replacing the float valve tower with packed column and increasing the height and diameter of the tower. But it required large investment and might face the restriction of workshop layout.

现有的改造方法是将浮阀塔改为填料塔，增加原塔高和塔径，但存在改造工作量大，费用高，有时会受现场条件的限制等缺点。

We have more than 60% of market share of china,our products are widely used by pipe and fitting factories,gas and water supplying companies,construction units etc.,part of the products are exported.

经过多年的发展，目前开发的产品包括热熔对接焊机、管件热熔焊机及异径管件对接机被国内各管材、管件生产厂家、煤气和自来水公司、专业施工单位等广泛使用，部分产品已远销海外市场。

The study results showed that the porosity, pore size, pore distribution and crush strength can be adjusted by the alternation of addition and powder size of pore-forming agent, the variating of addition of binding admixture, sintering temperature, holding time, forming method.

研究发现，改变成孔剂的加入量、粒径大小，粘结剂的加入量，坯料颗粒大小、成型方式，烧成温度、保温时间等方法可以调节样品气孔率、孔直径、孔径分布、压碎强度。

Based on the Visual Basic 6.0 platform, some new programs for various purposes are developed, such as for the calculation of tephra diameter parameters in the light of Sequential Fragmentation Theory by Wohletz

介绍了在VisualBasic6 。0平台下，碎屑粒径参数、岩浆黏度、结晶压力、喷出压力、给定时间段和特定区域的各高度层风参数、岩浆动力学参数、喷出物总量、抛射体分布、坍塌阶段碎屑分布和扩散阶段碎屑分布计算等各程序的主要结构及主要功能。

The mathematical relation formula is derived from the train running speed,distance and the output voltage frequency of tacho generator.

推导了列车运行速度、走行距离与测速发电机输出电压频率的数学关系式，给出了利用CMOS数字集成电路和频率合成原理实现上述关系的电路框图，并对其速度接口电路、轮径输入方法及频率合成电路、分频电路和BCD比例乘法器电路、显示电路、基准频率发生电路、电源电路等作了分析与说明。

Current main products of centrifugal cast iron roll, chilled cast iron rolls, unlimited Chilled ductile iron pipe and roll kind of tools rose by Roll, straightening roller, roller guide roll sizing Central products and even roller mill, high-speed wire Roll roll, such as hot-rolled, the company also produces DHT300, DHT350 tensile alloy die casting, mainly applies to stainless steel plate, the plate, drawing manufactures aluminium die tensile material.

公司目前主要产品有离心复合铸铁轧辊，冷硬铸铁轧辊，无限冷硬球墨铸铁轧辊以及制管工具类的涨减轧辊，矫直辊，定径辊导辊环类产品和连轧机辊，高速线材辊等热轧辊，本公司还生产DHT300、DHT350合金铸造拉伸模具，主要适用于不锈钢板，铁板，铝板拉伸制成品的拉伸模具材料。

Zinc sulfide nanoparticles with different sizes were synthesized by a unique precipitate dissolution method using zinc alkyl xanthate and sodium sulfide as zinc and sulfur sources, respectively. The samples synthesized were characterized by low temperature nitrogen adsorption and desorption, Transmission Electron Microscope, powder X-ray Diffraction and Fourier Transform Infrared Spectroscopy techniques.

以烷基黄原酸锌和硫化钠分别为锌源和硫源，采用烷基黄原酸锌沉淀溶解法制备了粒度可调、粒径分布比较窄的面心硫化锌纳米粒子，利用比表面积测定、透射电镜、粉末X射线衍射、傅里叶转换红外光谱等方法对合成的硫化锌纳米粒子进行了表征。

The effects of solidification time and temperature, types and amount of catalyst, and different grain sizes of quartz sand on sand-consolidation effectiveness are discussed.

评价了固化时间、固化温度、催化剂的类型和用量以及不同粒径石英砂等因素对固砂效果的影响。

The FTIR and TEM results show that Ce3-sol free from NO3-, CO32- was prepared by ion exchange method without washing, then the CeO2 crystal of high purity was synthesized by oxidation with H2O2 and vacumm drying. The sample obtained had an average diameter of 3 nm and good dispersity.

FTIR、TEM分析表明，离子交换法无需对合成的Ce3溶胶进行洗涤即可去除NO3-、CO32-等阴离子杂质，并用H2O2将该溶胶氧化，经真空干燥可制得粒径分布均匀，平均晶粒尺寸约3 nm，高纯度的CeO2粉体。

The influences of forming parameters,such as specification of heat treatment,nominal reduction of blank radius,feed ratio and roller track,on multi-pass neck-spinning of aluminum exhausted pipe used in vehicle are researched,and sound exhausted pipe s are developed by selecting reasonable processing parameters and roller tracks.

以铝质汽车排气歧管为研究对象，探讨了热处理工艺规范、名义压下量、进给比、旋轮运动轨迹等对三维非轴对称偏心及倾斜件多道次缩径旋压成形工艺的影响，通过选择合理工艺参数及旋轮运动轨迹，研制出合格的汽车排气歧管样件。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。