近摄

In the first section,the existence of solution for a class of non-linear systems with three -point boundary problem is obtained by applying the differential inequality theory .

在第一部分中，我们应用微分不等式理论证明了一类非线性系统三点边值问题解的存在性；在第二部分中，运用微分不等式理论研究了一类带有转向点的拟线性奇摄动边值问题的非单调内层解；在第三部分中，利用对角化方法研究了一类向量二点或者三点边值问题解的存在性，并获得解及它的一、二阶导数的渐近估计。

In order to analyze the stiffness of 3D 4 directional braided composites, the homogenization theory based on the multi-scale perturbation theory was used as the basic theory. The virtual displacement principle was used to educe the homogenization formulation of effective elastic modulus and the schemes to solve the problem using finite element method. The effective elastic modulus of 3D braided composites were predicted by this method and the calculation results agree quite well with experiment results.

在对三维编织复合材料刚度性能的分析过程中，以基于小参数渐近展开和多尺度摄动方法的均匀化理论为理论基础，用虚位移原理导出了等效弹性模量的均匀化列式及其有限元求解方程，从而通过细观和宏观有限元的数值分析方法预测了三维四向编织复合材料的等效弹性模量，预测结果与实验结果较为吻合。

For high altitude satellite, dissipative effect is not important at all, Perturbed by the attraction of the third body, the eccentricity will also have long periodic variation with large amplitude because of the apsidal resonance.

对于高轨卫星，大气的耗散效应已不重要，但在第三体引力摄动下，近点共振效应会使卫星轨道偏心率e出现大变幅的长周期变化，导致卫星落在主星上结束其轨道寿命。

After posterior lumbar instrumented fusion, radiographic changes suggesting disc degeneration appear homogeneously at several levels cephalad to fusion and seem to be determined by individual characteristics.

使用器械的后路脊柱融合术后，X线摄片改变提示靠近融合节段的近端的的几个相邻节段都会发生退行性改变，这种改变可能与个体因素有关。。

After posterior lumbar instrumented fusion, radiographic changes suggesting disc degeneration appear homogeneously at seeral leels cephalad to fusion and seem to be determined by indiidual characteristics.

使用器械的后路脊柱融合术后，X线摄片改变提示靠近融合节段的近端的的几个相邻节段都会发生退行性改变，这种改变可能与个体因素有关。。

The chest X-ray features of pleural effusion include a homogeneous opacity without air bronchograms, blunted costophrenic angle, the 'meniscus' sign, and complete or near-complete opacification of the hemithorax with contralateral mediastinal shift.

胸膜流出胸部X光特点包括同类的不透明，不用空气支气管造影摄片、被钝的costophrenic角度、'半月板'标志和hemithorax的完成或近完全opacification与对侧纵中的转移的。

METHODS: Sixty-nine extracted mandibular first premolars and 93 mandibular second premolars were used.Radiographs of teeth in mesiodistal direction were taken.

离体第一前磨牙69个，第二前磨牙93个，摄近中远中向的X线片，用Photoshop5.0软件分析根管，用Weine氏法测量根管的弯曲度，测量角度大于18度时，则认为根管存在明显的弯曲，根管的构型采用Vertucci分类法。

The I/O linearization method is applied to solve the mismatching problem of nonlinear perturbations in the system.

根据电堆温度机理模型，我们提出了变结构控制系统设计方案，快速平滑趋近律和快速收敛滑动模态被设计用来削弱抖振对系统的影响，并采用输入/输出线性化方法来解决系统中的摄动非匹配问题。

At the same time should do the following:(1) education of children washing hands frequently, wash hands properly;(2) ground剪指甲regular cleaning of toys and other children may have been talking about decentralization of the items;(3) near the road to keep the bedroom with wet erase parts of the children could be reached by the dust;(4) education of children and lead less than a road near the factory and play operation;(5) not in streets with heavy traffic, pushing baby carriages stroll;(6) workplace have lead contamination personnel (such as the smelter workers, traffic police, etc.) Do not wear work clothes to go home;(7) with coal as fuel bedroom window to ground ventilation;(8) high lead level for children to eat less food (such as eggs, burglary rice flower);(9) morning, open the tap water released in the first paragraph should not be used to cook food for the children;(10) to strengthen child nutrition, and ensure adequate calcium, iron and zinc intake.

同时应做到下列几点：(1)教育儿童勤洗手，正确洗手；(2)勤剪指甲，经常清洗玩具和其它可能被宝宝放到口边的物品；(3)近马路的居室要经常用湿布擦除孩子能触及部位的灰尘；(4)教育儿童不到马路边和铅作业工厂附近玩耍；(5)不在交通繁忙的街道推着婴儿车散步；(6)工作场所有铅污染的人员(如冶炼厂职工、交通警等)不要将工作服穿回家；(7)以煤为燃料的居室要勤开窗通风；(8)儿童少吃含铅量高的食品；(9)早晨打开自来水龙头放出来的第一段水不能用来为孩子烹食；(10)加强儿童营养，保证有充足的钙、铁及锌的摄人。

Because of the secular perturbation variations of the ascending node right ascension, the argument of perigee and the mean angle caused by the initial deviations of the semi-major axis, the inclination and the eccentricity are linear time-variant, then the active biases of the semi-major axis, the inclination and the eccentricity can realized the self-stabilization design of the elliptical orbit satellite constellation, and so the configuration stability will be improved.

通过初始偏差对椭圆轨道卫星的长期影响分析可知，轨道半长轴、倾角和偏心率的初始偏差对升交点赤经、近地点幅角和平近点角的长期摄动变化是线性的，因此通过主动偏置轨道半长轴、偏心率和倾角能够实现椭圆轨道星座构型的自稳定设计，从而提高其构型稳定性。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐