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An important problem of calculus of variations used in constrained differential systems, i.e., the commutation relation of differential operator and variational oprerator, is investigated by means of Frobenius theorem of integrability.

利用Frobenius可积性定理，研究微分约束系统一个重要的变分法问题：微分运算与变分运算的对易关系。

The aim of this paper is to study the existence of solution and multiply results for quasilinear elliptic system in bounded domain and the whole space, semilinear elliptic equation in two dimension space, second order nonlinear difference equation by variational methods. The main results are listed in the following:1. An abstract compactness theorem is proved, and then, under weak Boccardo and De.

本文主要利用变分法，分别研究了有界区域和全空间上拟线性椭圆型方程组、二维空间上半线性椭圆型方程和二阶非线性差分方程问题的解与多重解的存在性，具体内容如下： 1。

By applying the comparison theorem and some new analysis technique, some sufficient conditions which guarantee the permanence of the system are obtained. After that, by constructing a suitable Lyapunov function, sufficient conditions which ensure the global attractivity of the system are obtained.

利用差分方程的有关理论，使用与前面不同的分析方法，获得保证该系统永久持续生存的充分性条件；其后通过构造适当的差分Lyapunov函数，得到保证该系统全局吸引的充分性条件。

The series of ZNFM Full Automatic Lamianator is a compound device which uses the pre-pasted and no-glue film with papers,its head adopts Feida head automatic feeding system,the laminating steel rod using hot oil cycle heating system,the compound pressure adopts air pressure devices,the electrical control system uses PLC Programming controller,the cutting system equips with the cutting system of rotaty flying knife and uchigatana,the back equips with the automatic collecting system, it is space-saving and high degree of automatic,easy operation and high stable performance.

ZNFM全自动复膜机系列，用于预涂膜和无胶膜与纸张的复合设备，该复膜机头部采用飞达头自动输送纸系统，压合钢棍采用热油循环加温系统，复合的压力采用气压装置，电气系统采用PLC编程控制，分切系统配有打刀和旋转飞刀分切装置，复膜机后部配有自动收纸系统，整机占地面积小，自动化程度高，操作简便，稳定性高，是印刷及包装行业的首选设备，能为你在大量生产时可获得更好的经济效益。

Curing kinetics for two kinds of isomeric compound different proportion BPF-epoxy resin/MeTHPA/DMP-30 system is studied by means of differential scanning calorimetryand the extreme value method.

利用差示扫描量热法和极值法对两种同分异构体分布不同的双酚F环氧树脂/甲基四氢苯酐/DMP-30体系固化动力学进行了研究，求得了体系的固化动力学参数，并对同分异构体分布与固化特性之间的关系进行了初步讨论。

The structure of broad-leaved woodland has been studied from the relationship between stand mean age and stand density by two-way contingency table.

从林分密度与年龄结构的关系方面应用列联表对阔叶林林分结构变化规律进行研究。

In order to get the numerical solution, the paper devises a three hierarchic implicit scheme which eliminates the strict restriction of explicit scheme, thus, it can be used in more areas. By using the energy estimation method, the convergence and stability of the difference scheme are proved and the scheme is second order convergence for time and space.

对求解方程构造了一个三层隐式差分格式，消除了显格式的稳定性对计算步长的严格限制，使之适用范围更广，并用能量估计的方法严格证明了差分格式的收敛性与稳定性，该格式对于时间和空间均具有二阶收敛性。

The path covering with fallen leaves leads to the mountain village.

为了使你真正领会现在分词的用法，该题将过去分词与之编在一起。

Inverted surcharge of "temporarily used for" 2c on 3c junk 1st peking print, used on piece, tied by shanghai dater on sep 24, 1924, this stamp has the same position from the setting as that listed on p.270 of "prize selections爁rom the rocpex taipei'81", only about 20 pieces believed to exist, well-known as one of the "four rarities of republic of china", from overseas collector, extremely precious, vf rmb:

贴北京一版帆船加盖"暂作"改值邮票2分/3分倒盖变体剪片，销上海1924年9月24日戳，颜色鲜艳，齿孔完整，此票与台湾《邮展选萃》270页图为同一位置版式，存世仅二十枚左右，为"民国四珍"之一，此票源自海外藏家，首次在中国大陆拍卖会上出现，极少见，上品

Special 1c green 3rd issue cip postal card, space of inner frame is 116mm, space between top of the postage design and bottom line of upper frame is 2.5mm, uprated with 1c amp;2c cips, tied by chungking of szechwan lunar dater, chungking small cds alongside, with shanghai transit cds and shanghai german po in china cds, very rare for this particular card used in the 1st year of issuance, vf-f rmb:

1907年重庆寄德国清三次邮资明信片，为清三次片特殊版式，内框距为116mm，邮资图上端与上框下线距离为2.5mm，加贴蟠龙邮票1分、2分各一枚，销"四川重庆丁未九月三十日"干支戳，旁盖重庆11月5日小圆戳，有上海11月18日中转戳及上海德国客邮局11月18日戳，清三次片特殊版极少见，而首年使用更少见，是清代邮政用品邮集上乘素材，上中品

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。