本文以极简单的数学推导，给出了正常重力垂直梯度的实用表达式，并对其精度作出了评价。
By very simple mathematical derivations, the practical expression of (Vzz), the expression of normal vertical gravity gradient, and the comment on the accuracy were given.
提出了一个新的非线性迟滞隔振系统的动力学模型，并导出了系统动力学模型的实用表达式。
A new dynamic model for nonlinear hysteresis vibration isolation system is proposed, and the practical representation of dynamic model of the system is derived.
在执行请求之前，部署实用工具会估算每个表达式，并且会考虑到已部署的请求。
Before a request is executed, the deployment utility tool evaluates each expression, taking into account the already deployed request.
部署实用工具会分析请求之间的表达式所创建的依赖关系，并找出每条请求执行的顺序。
The deployment utility tool will analyze the dependency created by the expressions between requests to find out the order in which each request must be executed.
实用起见，规则表达式需要以特殊方式处理——为此我们使用grep。
For practical purposes, regular expressions need to be handled on an AD hoc basis — and we have grep for just this purpose.
用假设弱透镜焦距表达式是一个幂级数中的第一项的方法，可以导出相当准确且便于实用的电磁电子透镜物镜焦距公式。
By assuming the weak lens focal length expression to be the first term in a power series a simple and accurate formula can be derived for the objective focal length of a magnetic electron lens.
通过稳态分析得出了一些实用的解析表达式，并给出了一个设计实例，实验结果证明了理论分析的正确性。
Some practical analytic expressions are obtained by steady-state analysis, and a design example is presented. Theoretical analysis is verified by experimental results.
所求出的耦合系数表达式比耦合模理论的结果更为简单、实用。
The expression of coupled coefficient we obtained, is simpler and more precise in comparison with the results derived by conventional methods.
介绍了金品纯度的测定方法，推导出了比较实用的纯度计算、杂质估算和温度影响等几个表达式。
A method of quality apprarisal for gold products was introduced and several useful formulas for purity calculation, impurity element-estimation and temperature effects have been also deduced.
针对这一问题，利用转矩实用修正表达式绘制了启动特性曲线。
For this case, with torque practical correction expression, the startup characteristic curve basically conforms to the curve obtained from the experiments.
提出了获取结合面实用切向阻尼参数和变量表达式的方法。这些参数和表达式可以满足实际设计的需要。
Themethod of acquiring applied tangential damping parameter and variable expressions is developed, which can meet the requirement of mechanical design.
最后给出了实用的设计表达式。
Some proposals are advised for practical design and the design method is proposed.
匹配规律表达式简单明确，但实用范围却很有限。
The expression of the matching law is simple and clear, but there are some limits in its applications.
与其它方法相比，扩充的逻辑表达式具有方法简单、描述能力强、易于实现和实用性强等特点。
Compared with other methods, the ELE has the characteristics of simple, easy to describe synchronous relationship, easy for implementation, practical for developing WfMS, etc.
与其它方法相比，扩充的逻辑表达式具有方法简单、描述能力强、易于实现和实用性强等特点。
Compared with other methods, the ELE has the characteristics of simple, easy to describe synchronous relationship, easy for implementation, practical for developing WfMS, etc.
应用推荐