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The advantages and disadvantages of power line communication are described briefly, and the modulation technologies are summarized.

在介绍电力线信道特点的基础上，对现行载波通信的调制技术进行了总结。

Analysis of various structural characteristics of precipitator performance advantages and disadvantages, design ventilation dust removal system.

分析各种除尘器结构特点性能的优劣，设计通风除尘系统。

GA is a randomoptimization algorithm with global optimum capability, but it has the disadvantages of slow convergence and precocity.

遗传算法是一种具有全局寻优能力的随机搜索算法，但其本身存在收敛速度慢和易早熟的缺陷。

Standard genetic algorithm has some disadvantages, such as slow astringency, precocity.

标准遗传算法存在收敛速度慢、过早成熟等缺点。

Fuzzy C-mean algorithm has been being well used in the field of color image segmentation with some disadvantages such as:Predesignation of the number of clustering classes,high computational complexity and local optimal solution etc.

模糊C均值聚类算法广泛用于彩色图像分割，但该算法存在需要预先指定聚类数目、计算量大、耗时长且易陷入局部最优等缺点。

That's more advantages than disadvantages. The reason is as followed: Firstly, bankruptcy can end the investment of fund; secondly, it can program recombine of assets' prepotency, resulting new productive capacity; thirdly, it can carry out optimization and composition of the manpower capital earlier, reducing social cost. The last, it can reduce the tax revenue of local government.

虽然选择破产是没有办法的办法，但它可以使国有资产损失明朗化，是利大于弊的，这是因为，第一，破产可以关闭资金投入的无底洞；第二，可以进行资产优势重组，形成新的生产能力；第三，可以早日实行人力资本优化组合，减少社会成本；第四，可以增加地方政府税收。

Based on a certain disadvantages, concentrated in the traditional publishing model is a little bit of life and death situation to be shaken, society needs a new business model, make book publishing more conservation, more cost-effective, more efficient, more diverse, and yuanjiangensis is without doubt this social demand this of the prepotency lization of "."

基于必定的长处，古板不入书模式把持生杀的场面不天步侧在一不面不面不天被动摇，社会必给一栽陈的筹办模式，让典籍不入书更耗费能源、更耗费不梢钱、更矮效、更众样冻，而POD无疑是这栽社会需求下呱呱落不天的"优生儿"。

Comparison of Figure 1, the actual ink absorption curve and ideal absorption curve vary greatly, that is, they should not only absorption spectral absorption of light in the region, and also took in a different light spectrum, in the region, and it's caused by harmful absorption is the direct consequence of hue and saturation of the ink and the larger the gap between the ideal primary colors, but cards and card making products is using the ink features hue and differenc, the ink color performance advantages and disadvantages of a direct impact on original lifelike.

如图1的比力来看，油不朱的本质汲取弧线和抱负的汲取弧线差别很大，也不离是它们不仅汲取不该汲取的平谱不天区边的平芒，也汲取了其他平谱不天区边的平芒，而这栽无益汲取变不败的间接不败果不离是油不朱的色相和饱和度与抱负不一原色差距较大，而制卡和会员卡制作品不离是用油不朱来表示色和解条理的，因此油不朱的呈色本能机能的短长间接感化到草稿复制的传神水平。

This article will introduce the various types of reduced-order model, analysis of their principle, comparison of their advantages and disadvantages.

本文将介绍各类降阶模型方法，分析它们的原理，比较它们的优缺点。

This paper brings up with the theory of Virtual Coordinate Measuring System. The basic theoretic models of the virtual coordinate measuring system are given. This theory of virtual coordinate measuring system makes use of the principle of Time-Space correspondence and turns the time pulses into spatial displacement. The virtual coordinate measuring system can take the place of the scale system in traditional instruments, which has the disadvantages of high cost and difficulty ofproduction.

本文同时提出并建立虚拟坐标测量系统理论；该理论从传统的测量仪器出发，将传统仪器的实物标尺系统虚拟化，克服了实物标尺系统加工制造困难，及造价高等缺点，将硬件结构简化；本文提出并建立初步的虚拟坐标测量系统模型，并在三坐标测量机上建立了一维虚拟坐标测量系统的实验模型，初步分析系统的系统误差与其随机误差源。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。