优缺点

The principles of FEM, finite difference method , numerical mode method and integral equation method are elaborately described.

详细阐述了非均匀介质问题中常用的有限元法、有限差分法、数值模式匹配法和积分方程方法的基本原理和各自的优缺点。

Aiming at the phenomena of two border upon workroom at the same time cut in the centra- power supply mode of great online UPS,the advantages and disadvantages and reliability in several power supply mode of great on-line UPS were analyzed.

针对大型在线式UPS集中供电模式中两相邻工作房间同时出现停电的现象，对大中型UPS几种供电模式的优缺点及其可靠性进行了分析研究。

The operating principle, characteristic, types, advantages, and disadvantages were discussed. The current situation of CTP technology application was analyzed and its development trend in our country was put forward.

论述了CTP技术的工作原理、特点以及CTP技术的类型和各自优缺点，并通过对CTP技术在我国应用现状的分析，展望了CTP技术在我国的发展趋势。

Making use of optimality principle, we get the mathematical model of this practical problem.

再用其它求最短路问题的某些算法求解这个实际问题，几种算法进行对比，从而得出该模型的优缺点。

Methods of reducing the Peak-to-Average-Power Ratio of the Orthogonal Frequency Dixision Multiplexing system have their advantages and disadvantages.

在降低OFDM系统峰均比的众多方法中，均有其优缺点。

Structure and the frequency output characteristic of the quartz crystal sensor are described.

介绍了石英晶体传感器的结构及频率输出的特点，分析了由石英晶体构成的温度、应力、微质量、声压等传感器的测量机理，评述了与其对应的各种应用及其优缺点。

According to the nature of Nanchuan city and the outturn and component of garbage there,the article predicts the outturn of the Landfill-Gas,applying the quality balance theory gas producing model of IPCC and the index model these two kinds of methods,and analyzes the advantages and disadvantages of the two predicting ways.

根据南川市的城市性质、垃圾产量与组成，运用IPCC质量平衡理论产气模型、指数模型两种方法预测了填埋气体的产生量，并分析了两种预测方法的优缺点。

We begin with parallel technology of edge and area segmentation. Then some typical algorithms are introduced.

本文着重讨论了并行边界分割技术和并行区域分割技术，介绍了其中的一些典型技术并分析其优缺点。

Firstly, this paper analyzes and summarizes the research situation of resonant soft-switching technique and main topologies. And it indicates the main advantages and disadvantages. Then it pays more attention to analyze the parallel resonant DC link circuit theory and operating modes. It also analyzes how the resonant circuit realizes the resonant process. This paper also simplifies the control part design of the parallel resonant DC link soft-switching inverter by DSP.

本文首先对谐振软开关技术的研究现状和各种主要的拓扑结构进行了分析、综合、总结，指出了各自的优缺点；着重对并联谐振直流环电路的工作原理、电路工作模式、软开关实现机理及谐振参数的确定等进行了深入详尽的分析；利用DSP的灵活调节特点，有效地简化了并联谐振直流环软开关逆变系统的控制环节设计。

Then, the advantages and disadvantages of the two common topologies (series resonance and parallel resonance) are compared, and their switching processes are also analyzed.

详细比较了两种常用谐振电路拓扑的优缺点，着重分析了两种电路换流过程。

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