有效中心

The RWTH Aachen University has a long history of close and wide-ranging co-operation with national and international industries and research centres and contributes effectively to the success and development of the German economy with an increasing extension of this role with regard to the European Union.

在RWTH Aachen大学有着悠久的历史密切和广泛的合作，与国家和国际产业和研究中心，并有助于有效的成功和发展的德国经济与日益扩大这一方面的作用，欧洲联盟。

In this paper, the primary terms in closed form, which are essential to the influence of interference effects of the notches are obtained by means of the modification of body force densities, the adoption of local coordinates with respect to the center of each notch element and the decomposition of Melan's fundamental solutions. Thus an improved body force method is proposed for analyzing interference effects of random boundary notches subje-cted to complex loads.

本文通过修改体积力密度的定义、引入建立在各缺口单元中心处的局部坐标并分解Melan基本解，获得了影响缺口群相互干涉效应的主项封闭解，从而建立了能有效地分析复合载荷作用下任意边界缺口群相互干涉效应的改进型体积力法。

Public Relations Strategy whose basic characteristic is focused on competition and strengthens enterprises' whole quality and puts effective information dissemination into practice is a development strategy of a new generation of enterprises under the situation of buyers' market....

公关战略&，其基本特征是以竞争为中心，全面强化企业素质并实施有效的信息传播，是买方市场发展条件下的新一代企业发展战略。&公关战略强调公众关系目标对企业发展的战略意义，重视与公众关系环境的协调平衡，以实现自身的可持续发展。

The reaction centers and antenna systems were damaged by active oxygen under chilling stress as indicated by quick decrease of PSⅡ photochemical efficiency and low qNP.

低温下冷敏感品种反应中心和天线系统更易受到活性氧的伤害，PSII光化学效率下降多，并不能发展有效的qNP途经。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。