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门禁系统按设计原理可分为以下两类：　　1．控制器自带读卡器（识别仪） 　　这种设计的缺陷是控制器须安装在门外，因此部分控制线必须露在门外，内行人无须卡片或密码可以轻松开门 。 　　2．指纹考勤机控制器与读卡器（识别仪）分体的 　　这类系统控制器安装在室内，只有读卡器输入线露在室外，其它所有控制线均在室内，而读卡器传递的是数字 信号，因此，若无有效卡片或密码任何人都无法进门。　　这类系统应是用户的首选。 　　门禁系统按与微机通讯方式可分为以下两类： 　　1．单机控制型　　这类产品是最常见的，适用与小系统或安装位置集中的单位。通常采用RS485通讯方 式。门禁的优点是投资小，通讯线路专用。缺点是一旦安装好就不能方便地更换管理中心的位置，不易实现网络控制和异地 控制。 　　2．网络型　　这类产品的技术含量高，目前还不多见，只有少数几个公司的产品成型。门禁的通讯方式采用的是网络常用的TCP/IP协议。这类系统的优点是控制器与管理中心是通过局域网传递数据的 ，管理中心位置可以随时变更，不需重新布线，很容易实现网络控制或异地控制。　　适用于大系统或安装位置分 散的单位使用。这类系统的缺点是系统的通讯部分的稳定需要依赖于局域网的稳定。

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The main chemical composition of crystal is carbon dioxide. The crystal purity is based on the content of the lead oxide. The more the content of lead oxide is, the brighter is the color and luster and the heavier is the weight of crystal. If the purity of Crystal Chandeliersis high, there are no stripes, bubbles, water ripples and impurities. Futhermore, the crystal is very glittering and translucent and can play the best chemical efficiency. The whole lead crystal is adopted in manufacturing the high quality crystal products, whose content of lead oxide is no less than 30%, LED stripthe materials are the purist and the products can emit the most glittering light. The first crystal chandelier was produced in France. At present, our imported crystal materials are mainly from Egypt and Austria. The origin of crystal chandeliers: Since ancient time, the people used quartz to manufacture every kind of kitchen decorations. Crystal Chandeliersfrom 18th century, the first chandelier made of the crystal glass appeared in France. At that time, the crystal chandelier was a very expensive ornament and only used in the Royal Palace, the magnificent churches and halls. At present, the crystal chandeliers are no longer the patented articles of the imperial families or noblemen. The ordinary people who are particular about the layout of furniture often consider selecting a glittering crystal chandelier to add to the imposing air of the house. In addition to its indoor lighting effect, the Crystal Chandeliers has the special cultural background as well as the classic or modern design whicn can be mixed into the different effects so that an ideal atmosphere and an imposing air can be created. LED stripThe Chinese crystal is mainly produced in Zhejiang province.

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本文强调的观点是：在网站优化中应坚持以用户为导向的原则，网站优化公司因为网站的内容和服务是否有价值最终是由用户来判断的，北京GOOGLE优化即使网站在搜索引擎中的表现很好，北京GOOGLE优化公司如果用户使用感觉很不方便，同样不会产生理想的效果。而且，网站推广也并非完全依赖搜索引擎，还需要综合考 虑各种相关因素GOOGLE优化公司Google排名。因此网站优化设计中三个层面的内容不能顾此失彼，应实现全面优化，尤其是对用户的优化应 放在首位

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