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The design mainly works on many factors which effecting the volume efficiency of fracturing pump. These factors are working conditions of the pump,imbibitional valve,expulsive valve,clearance volume,sealing property, condensability of influent, liquid leakage and elastic defletion of pump cylinder. Based on these facors, we should induce the efficiency expression, famulate differential eguation and emulational mathematical model of fracturing pump.

本设计主要针对影响压裂泵容积效率的因素如：泵的工作情况、吸液阀结构参数、余隙容积、密封性能、液体的可压缩性、液体泄漏、泵缸的弹性形变等方面进行分析，在此基础上导出效率的表达式，建立微分方程，并建立压裂泵效率仿真的数学模型。

This is a cylinder composed solely of carbon atoms, and one of its properties is good electrical conductivity.

碳纳米管是一种全部由碳原子组成的圆柱体，它的一大优点是良好的导电性。

The general type that decelerate the machine has:The cylinder wheel gear decelerates the machine ,cone wheel gear decelerates the machine ,wheel gear-cochlea pole decelerates the machine ,stalk park type decelerates machine ,assembles type decelerate machine ,couplet type decelerate machine ,couplet type decelerate machine .

减速器的一般类型有：圆柱齿轮减速器、圆锥齿轮减速器、齿轮-蜗杆减速器、轴装式减速器、组装式减速器、轴装式减速器、联体式减速器。

The abstract lathe is in the machine manufacture uses a most widespread kind of engine bed, mainly uses in processing each kind of rotation surface (for example: In the outer annulus cylinder, the circular conical surface, the ring groove, the solid of revolution formation surface and so on) and the solid of revolution end surface, some lathes also can process the thread.

车床是机械制造中使用最广泛的一类机床，主要用于加工各种回转表面（如：内外圆柱面、圆锥面、环槽、回转体成型面等）和回转体的端面，有些车床还能加工螺纹。

The pistion of the ram is connected to the secondary set and the cylinder to the primary set.

该活塞的RAM是连接到中学设置及调节器，以小学设置。

This new thermodynamic cycle consist of: The feeding of the charge cylinder at constant pressure.

这种新的热力循环包括：喂养的收费缸在不断的压力。

Characteristic of contact force and its effect on limit load were investigated between pad and cylinder.

本文采用有限元分析方法对壳体-补强圈之间的接触行为进行了研究，阐述了接触压力的特性以及接触压力对极限载荷的影响，并对计算结果进行了误差分析。4。

At the same time, this paper set up a three-dimensional model, then analyzed and calculated of conducting cylinder heat transmission through software MATLAB and COSMOS. A mathematic model initial injection pulse-width is set up according to the quality's continuousness and the energy conservation law.

根据气体状态方程和能量守恒定律分析建立了基本喷油脉宽的数学模型，并运用在国产125ml摩托车汽油发动机上，仿真得出此发动机电控汽油喷射系统的初始喷油MAP图。

For gas flow past cylinder, the characters of flow field in different Mach number and Knudsen number condition were investigated, and especially for low Knudsen number cases, the results were compared with calculating results of Euler's equation. It showed that they are correspondent by comparing the characters of bow shock and wake. The convergence rates of different high resolution and implicit schemes were also investigated. The convergence behavior of the implicit WENO scheme developed in this paper is better than others. For gas flow past NACA 0012 airfoil, the calculating results were compared with results of experiment. It showed that the results of WENO scheme are of higher accuracy for the case with angle of attack.

在圆柱流场时，我们探讨不同马赫数且不同纽森数时的流场特性，并在低纽森数时，与那维尔-史托克方程式的计算结果比较，我们比较了弓形震波及尾流附近的特性，其结果是相当符合的，同时我们也比较不同高解析隐式算则的收敛历程，从收敛历程图可得到，本文发展出来的隐式WENO算则有较佳的收敛效果；在NACA 0012翼形的流场中，我们将与实验结果做比较，发现利用WENO算则计算的结果，对於具有攻角的流场，亦有相当高的准确度。

Hydraulic cylinder will be able to provide the hydraulic-mechanical energy conversion device called actuators.

将液压缸提供的液压能重新转换成机械能的装置称为执行元件。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。