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PVC subdrainage is one kind of advanced drainage techniques developed inrecent years in the world.It will have a promising future of wide application incontrolling the threat of waterlogging,reclamating the lower—yield lands and re-constructing the lands with higher and stable crop yield in the lower reach polderareas along Changjiang River.

塑料暗管排水是世界上新近发展起来的一项高科技排水技术，对防止长江下游圩区三麦渍害，改造中低产田，建设高产稳产农田具有广阔的应用发展前景。

By constructing different quotient spaces,using the method of symplectic geometry,the self-adjoint extensions of symmetric differential operators in the direct sum spaces for the different deficiency indices at(2,2)singular points was discussed. The classification and description of complete Lagrangian submanifold that correspond with self-adjoint domains of second order differential operators were given.

由于对称微分算子在端点处的亏指数取值情况不同，当微分算子在端点处的亏指数均取(2， 2)时，通过构造商空间，应用辛几何的方法讨论了直和空间的对称微分算子的自共轭扩张问题，并给出了与二阶微分算子自共轭域相对应的完全Lagrangian子流型的分类与描述。

From special to normal, the problem of constructing a Jacobi matrix with a prescribed principle submatrix and two ordered defective eigen-pairs has been solved gradually in this paper.

遵循从特殊到一般的原则，本文逐步解决了由给定一个顺序主子阵和两个有序缺损特征对构造Jacobi矩阵的问题。

The matrix extension problem is, under some constrained conditions, constructing a matrix A with a given matrix A_0 as its submatrix.

矩阵扩充问题是在某种约束条件下构造矩阵A，使得矩阵A的一个子矩阵为A_0.1979年，H。

In the middle of this paper, six kinds of basic Petri net flow modules which conform to Workflow model are put forward. The method of transforming Petri net flow model to XPDL and constructing Petri network using XPDL is given. These establish the base for different modeling method using Petri net. And these extend EJB task engine and Subprocess task engine of distributed Workflow Management System——Flowstep.

文章中心部分是提出了符合工作流元模型的六种基本Petri网流程模块，给出了由Petri网流程模型向XPDL转换的方法以及由XPDL构造Petri网的方法，为不同的建模方法利用Petri网分析技术奠定了基础；扩展了分布式工作流管理系统Flowstep的EJB任务引擎和子流程任务引擎。

In this paper, inverse scattering series method is based on wave equation and Born series, multiples are predicted and removed by constructing a subseries corresponding to surface-related multiples. This method does not need any subsurface information and is suitable for different kinds of complex structures.

本文研究的逆散射级数法以波动方程和Born级数为基础，构造一个与自由表面多次波相关的子序列来预测并消除多次波，该方法不需要知道地下的速度结构信息，适用于各种复杂的地下情况。

Methods The high invasiveness subseries cell lines were selected based on the penetrating power of artifical basilar membrane and polycarbonate membrane through constructing invasive cabin.

通过构建侵袭小室，以穿透人工基底膜、聚碳酸脂膜能力为依据筛选具有体外高侵袭能力的膀胱癌细胞亚系。

Objective To establish the high invasiveness subseries cell lines of three bladder neoplasm strains of BIU-87,EJ and T24,and to observe the invasive process in vitro.Methods The high invasiveness subseries cell lines were selected based on the penetrating power of artifical basilar membrane and polycarbonate membrane through constructing invasive cabin.

医药卫生体制改革最新方案内容概览及其展望多种自身抗体联合检测对类风湿性关节炎作用持续高眼压下青光眼手术治疗的临床观察目的建立BIU-87、EJ和T24 3株膀胱癌细胞的高侵袭力亚系，并对侵袭过程进行观察。

There are some questions on task of constructing rural minimum subsistence allowance,such as the ditch of accumulating fund,the guarantee level,etc.

党的十六届全会通过的《中共中央关于完善社会主义市场经济体制若干问题的决定》指出：农村养老保障以家庭为主，同社区保障、国家救济相结合。

Works in this paper can provide useful information for design and constructing of subterranean structures.

通过本论文所作的工作，可以为地下结构开挖的设计与施工提供参考依据。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。