主要动力

The main effect factors of the middle-transport efficiency are the level of transport supply and the structure of transport supply, the degree of transport modes technology progress, the degree of competition and cooperation among the transport modes or within the special transport mode, the degree of symmetry of the obligation of every transport mode and the regulation degree of the government. The main effect factors of the micro-transport efficiency are the market environment, the impetus mechanism, the response capacity and the level of transport organizing and technology progress.

本文提出宏观运输效率的主要影响因素是运输相关技术的发展水平和运输政策选择；中观运输效率的主要影响因素是运力供给水平与结构、运输方式的技术进步程度、运输方式之间及其内部的竞争与合作程度、各运输方式与社会受托责任的对称性程度、政府对各运输方式的管制程度；微观运输效率的主要影响因素是市场环境、运输企业的内部动力机制、运输企业的应变能力及运输企业的生产组织和技术进步水平。

Its main function is,according to the components processing request,arranging various main axles position and bequeathing the power and the movement by the electrical machinery or the power part to each work main axle,ena

其主要作用是：根据被加工零件的加工要求安排各主轴位置，并将动力与运动由电机或动力部件传给各工作主轴，使之得到要求的转速和转向。

The research of this thesis is supported by China National Natural Science Foundation. The static and dynamic behaviour of slabs on foundation and doweled slabs of concrete pavement, identification and comparison of static and dynamic parameters are studied emphatically in this paper.

本文在国家自然科学基金项目资助下开展工作，着重研究了混凝土地基板与接缝板的静、动力特性及静、动力参数的识别与比较，主要包括以下几个方面的具有特色的内容。

ABSTRACT The research of this thesis is supported by China National Natural Science Foundation. The static and dynamic behaviour of slabs on foundation and doweled slabs of concrete pavement, identification and comparison of static and dynamic parameters are studied emphatically in this paper.

本文在国家自然科学基金项目资助下开展工作，着重研究了混凝土地基板与接缝板的静、动力特性及静、动力参数的识别与比较，主要包括以下几个方面的具有特色的内容。

Dynamic analysis models for the train, bridge and track are established. And their dynamic equilibrium equations are derived.

本文的主要研究内容如下：(1)建立了车、线、桥动力分析模型，推导了各分体系动力方程。

Is a company specializing in small-scale power machinery company, founded in 1997, the main production of small gasoline engine, small diesel engines, generator sets, Brush Cutter and aluminum die castings, has been 10 years of development and production history, product has excellent quality and reasonable prices received by domestic and international clients affirmation become peer leader.

永康市吉能动力机械有限公司是一家专业于小型动力机械的公司，创建于1997年，主要生产小型汽油机，小型柴油机，发电机组，割灌机及铝压铸件，至今已有10多年的开发与生产历史，产品已以优良的质量及合理的价格深受国内外客户的肯定，成为同行中的佼佼者。

The latest, which was to be launched at the abandoned Dairy Event 2007, is the 18m3 twin vertical auger Euromix 1870, which has a relatively low power requirement (5 hp per cubic metre) due to the shape of the body and position of the augers.

2007年这款新型的饲料搅拌车为18方双绞龙立式的，型号为Euromix 1870，这款机器的主要特点是所需动力小(每立方所需动力为5马力)，由于这款搅拌机箱体的形状和绞龙的位置决定的。

The said tunnel will mainly be used to evaluate aircraft stalling/tail shaft performance, and to do complicated aerodynamic stability research in the recovery process of recoverable satellite and manned spacecraft as well as aerodynamic research in other related fields.

这座立式风洞投入使用后，主要用于飞机失速／尾旋性能评估、返回式卫星和载人飞船回收过程中复杂的空气动力稳定性研究，以及其它相关领域的空气动力研究。

After analyzing the hydrodynamic condition and the variations of the water environment factors over the past 20 years(1983-2003) of Tieshangang bay ,we tried to find out the relationship between the self-purifying ability and the environment factors of Tieshangang Bay.

通过对铁山港湾水动力条件及20a(1983~2003年)来水环境因子变化状况的分析，探讨了该湾水体自净能力及其与环境因子之间的关系，结果表明：该湾具有较强的水体自净能力，但其物理净化能力是以潮流的水动力作用影响为主，迳流影响较小，与北海湾和钦州湾有明显差别；其化学净化能力主要体现在溶解氧的含量水平、有机污染物的氧化分解能力、营养盐的形态转化及消减程度上；其生物净化能力则体现在微生物及浮游动植物对有机物的直接降解及间接贡献上，具有贫营养区的水体自净特点。

The result showed that the strong storm followed by mesoscale squall line was primary cause of strong sandstorm producing, steps and ladders short wave trough of 500 hPa was great criterion triggering system for the mesoscale squall line producing, the essential dynamic condition was provided by distortion field and the mesoscale low pressure of 700 hPa for the strong sandstorm forming and maintaining in mid-west of Hexi Corridor, the deep vertical circulation development condition was basic power that urged squall line to occur and sand dust to curl up, which was provided for the deep convection development by superimposition of lifting movement before ground cold front and ascendant current of secondary circulation in upper air jet entrance region, temperature and the barometric gradient around the cold front was enlarged by enhancement of ground thermal low and temperature diurnalvariation of afternoon, by which essential thermal energy unstable condition was provided for the gale and strong sandstorm eruption, the strong sandstorm appeared in downstream of -200 m^2s^(-2) center of vertical helicity, the vertical helicity had good instruction significance for development of squall line and landing region of sandstorm, the mesoscale squall line occurred in unstable stratification, basic condition of potential energy transforming as kinetic energy was provided by strong unstable stratification for the strong sandstorm forming and developing.

结果表明：中尺度飑线所伴随的强风暴是产生强沙尘暴的主要原因；500 hPa阶梯短波槽是中尺度飑线产生的大尺度触发系统，河西走廊中西部700 hp变形场、中尺度低压为强沙尘暴形成和维持提供了必要的动力条件；地面冷锋前上升运动与高空急流入口区次级环流的上升气流的叠加，为深对流发展提供了深厚的垂直环流发展条件，是促使飑线发生和沙尘卷起的基本动力；地面热低压的加强和午后气温的日变化加大了冷锋前后的温度和气压梯度，为大风、强沙尘暴爆发提供了必要的热力不稳定条件；强沙尘暴出现在垂直螺旋度为－200平方公尺/s^2中心的下游，垂直螺旋度对飑线的发展和沙尘暴的落区具有较好的指示意义；中尺度飑线发生在不稳定层结内，较强的不稳定层结为强沙尘暴形成、发展提供了位能转化为动能的基本条件。

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。