查询词典 natural selection

The main content of the is selecting programme, the design of the speed reducer, the selection of structure of the pump selection, the design of the pump body,and the design of the connecting rod, the design of the crosshead.

设计的内容主要有方案的选定，减速器的设计，泵的结构形式的选择，泵体的设计，曲柄连杆机构的设计，十字头的设计。

The selection of appropriate deaeration and de - salting equipment and proper design of the velocity and selection of corrosion - resistant materials like 12Cr2AlMo and Cr5Mo etc can effectively control the corrosi.

选用先进的除氧除盐设备，合理的流速设计和选用12Cr2AlMo，Cr5Mo等耐蚀材料可有效控制软化水系统的腐蚀。

The parameter selection in many proposed methods in this area is evaluated firstly by defining a discriminability function computing on some synthesized defect images,and thereby an efficient parameter selection method is proposed in real time constraint.

通过定义一个分辨力函数和一些合成的疵点图像，对已有的Gabor滤波器组的参数选择方式做出评价，提出了在实时应用场合有效地确定Gabor滤波器组参数的方法。

In the selection of the subcategory of verbs and material classifiers, but disyllabic adjectives are free at their selection.

通过单双音节形容词的选择性考察，说明二者在语用上并不完全等价，单音节形容词往往受到较多的限制。

The invention discloses a MicroTCA system, which comprises an MCH, and a clock card and a plurality of AMC cards connected with the MCH, wherein the clock card includes a clock selection unit for selecting a clock source and outputting, and a phase locking unit for generating a system synchronous clock from the clock source selected by the clock selection unit of the clock card; and the MCH includes a clock drive unit for driving the system synchronous clock generated by the clock card to the plurality of AMC cards connected with the MCH.

本发明公开了一种MicroTCA系统，包括：MCH、与所述MCH连接的时钟卡及多个AMC卡，其中，所述时钟卡包括：时钟选择单元，用于选择时钟源并输出；锁相单元，用于将所述时钟卡的时钟选择单元所选择的时钟源生成系统同步时钟；所述MCH包括：时钟驱动单元，用于将时钟卡所产生的系统同步时钟驱动到与所述MCH相连的多个AMC卡。

Various drums choosing the material stress, crafts Fine, selection of high-quality wood to make drum body, drum body robustness, appropriate level; selection of high quality male yellow cattle skin and the high quality water cow skin for drum surface. The quality of the skin with a quality body wood, after the traditional manual process, finely crafted processed.

各种鼓选料讲究，工艺精细，采用优质木材做鼓身，选用上等的雄性黄牛皮和优质水牛皮做鼓面，经过传统的手工工艺，精雕细琢加工而成。

Among of these, the research of TEHV has taken positive progress,but the research of EHT just started recently ,it is still facing a series of problem.At first,it is the selection of planting cells,how to take high degree of purity about cardiomyocytes should be overcome;Second,it is the selection of scaffolds,the biomechanical properties of scaffold been used still can,t meet the requirement.

首先是种子细胞的选择，如何获取纯度较高的心肌细胞，还需从各种种子细胞中进行筛选；其次是支架材料的选择，目前应用的材料在生物力学特性上还不能满足临床使用的要求，还无法承受左心室巨大压力的冲击，因此还有待进一步的研究和改进。

Some research have done on the selection f the eigenvector which used to create the eigenspace ,the distance measure methods and the selection of the training set.

由于人脸图像的特殊性，人脸识别问题也是模式识别领域的一个相当困难的问题，要使这一技术成为完全成熟的技术还有许多工作需要去做。

Since 1970s to now, secondary vocational education has transformed from the"ideal selection" of most people to "unwilling selection"of disadvantaged group, and the transformation is corresponded with the flourish and enervation of secondary vocational education.

只有当中等职业教育成为"大多数"人的"理想选择"时，才有走向兴旺的可能性，不符合其中任一指标，都不能说中等职教获得了兴旺的发展。

A variable-step modified Euler time integration method is proposed and analyzed. Four major factors that affect the efficiency of the variable-step modified Euler time integration method are discussed. These include stability and accuracy analysis for the damped fix-step modified Euler integration formula, adjustment method of the fix-step basic integration formula to accommodate step-size changes, suitable range of the step-size selection strategy based on truncation error concept and development of the step-size selection strategy based on apparent frequency concept to satisfied the specified error bound and stability condition.

提出了变步长修正Euler时间积分法，详细讨论了影响变步长修正Euler时间积分算法效率的四个主要因素，它们包括：有阻尼问题的修正Euler法的稳定性和精度分析，调整固定步长的基本积分公式使之容纳步长大小变化的研究，基于截断误差概念的步长大小选择策略适用范围的讨论，同时满足规定误差界和稳定性条件的、基于表观频率概念的步长大小选择策略的建立。

As of Tuesday, Google's results were still censored in China.

截至周二，谷歌的搜索结果仍受中国审查。

In order to make the positive action increase and negative one decrease, the sub-forces of the social factors must be adjusted to form a centripetal force.

在这一过程中，人的主体性发挥是社会有机体健康发展的灵魂。