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Which lead-free wave soldering, lead-free reflow after several years of research and development, has now reached international advanced level.

其中无铅波峰焊、无铅回流焊经过几年研究开发，目前已达到国际先进水平。

In the course of the lead free reflow soldering,lead and Lead free of reflow soldering affect the quality of product.

在再流焊无铅化过程中，再流焊的有铅要素与无铅要素的兼容性直接影响产品质量。

The free-surface boundary conditions are satisfied on the free-moving surface exactly without any approximation or linearization. The governing equations and the boundary conditions on the time-dependent, physical domain are transformed onto a regular domain for numerical computations.

为於未知的自由液面边界上满足非线性边界条件，本模式利用座标转换，将非稳态且不规则物理区间的流场控制方程式与边界条件，映射至规则的计算区间，以进行数值解析。

According to the effect of relative permittivity εr on the pulse propagation velocity in lossy dielectric space and the effect on the turnround time of signal between the antenna and the buried objects, it is presented that lossy dielectric space can be transformed into free space and the simulation results abtained from free space can also be amended to lossy dielectric space.

对探地雷达的微波全息成像法进行了分析研究，根据有耗介质空间中的εr 对脉冲传播速度的影响，以及对脉冲在收发天线与目标之间的往返时间的影响指出：可将有耗介质空间转化到自由空间，再将自由空间中的计算结果修正到有耗介质空间。

In accordance with general societal moral standards, free sex is morally sound, but sex that is not free is morally reprehensible.

按照一般的社会道德标准，免费的性才是道德高尚的，而不免费的性是道德低下的。

In order to study the numerical method to solve the viscous incompressible flow with free surface, the 3-D mathematical model for steady and unsteady hydrodynamic problem had been established and closed by k-εbuoyant turbulence model. The algebraic coordinate transformation method was used to fit the free surface, the Runge-Kutta method of three step and second precision was devised to simulate the time step. A high precision up-winding compact scheme was studied for the convection term, and the generalized conjugate residual method was set to solve the Poisson equation.

为了研究粘性不可压缩三维问题的数值求解方法，本文从基本的Navier-Stokes方程出发，采用代数拟合方法处理自由表面，用三级二阶Runge-Kutta方法对时间步进过程进行了模拟，并且对对流项的高精度迎风格式进行了研究，给出了求解压力Poisson方程的广义共轭剩余法，从而建立了能够模拟有自由表面的粘性不可压缩问题的定常、非定常三维水动力学模型，并采用k—ε浮湍流模型对其进行封闭。

Among these, in addition to free software, other types of software itself is a fringe of the rights or obligations of the user settings, specifically, free trial software is the traditional business "after the first trial using products," the network piracy, Sharing software users to read is usually indirect advertising revenue made the "indirect charges software", open-source software is usually require users to change in the commitment to open source after the revision of the obligation.

这其中，除了完全免费软件外，其他类型软件本身就是附带着某种权利或对使用者设置义务的，具体说来，免费试用软件不过是传统商务中"先试后用产品"的网络翻版，共享软件通常是以使用者阅读广告间接取得收入的"间接收费软件"，开源软件则通常要求使用者在改动源码后承担公开修改内容的义务。

But am here posting 9 free DVD ripper which are totally free to use.

但我在这里发布9免费的DVD开膛，这是完全免费使用。

Defined the nodal velocity on the moving interface of theALE mesh as a product of a scalar and a shape vector, the kinematical boundary con-ditions on the free surface is modified to increase the freedom of the movements of thegrid on free interface.

将ALE网格运动界面节点的速度定义为一个标量和形状向量的乘积，用它修正自由液面网格速度与流场速度关系式，以增加自由面网格节点运动的自由度。

Objective To discuss the effect of free radical and free radical scavenge on the damage of kidney.

目的 探讨自由基及其清除因素在肾脏病理损害过程中的影响。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。