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Economic Management 25位商业领袖:影响世界的商业领袖
Economic Management 35岁前要做的33件事:成功人生的重要分水岭
Economic Management 60分钟企业经营战略:10倍速商业经典
Economic Management 18岁以后懂点经济学
Economic Management 12小时MBA教程
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Economic Management Action!管理开拍:周星弛搞笑电影中的管理
Economic Management CEO的海军陆战队
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Economic Management 1999到2000年中国经济发展趋势预测分析
Economic Management Cyber超市的网上销售方案
Economic Management MBA考试辅导英语分册
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Economic Management MBA工商管理800案例:理财之道竞争谋略
Economic Management MBA考试辅导管理分册
Economic Management MBA考试辅导逻辑分册
Economic Management 35岁前要做的33件事:成功人生的重要分水岭
Economic Management 60分钟企业经营战略:10倍速商业经典
Economic Management 18岁以后懂点经济学
Economic Management 12小时MBA教程
Economic Management 12小时哈佛商学经典
Economic Management 2号人物
Economic Management 7位成功大师的炒股智慧:世界上最会炒股的人
Economic Management 12小时哈佛管理学
Economic Management Action!管理开拍
Economic Management Action!管理开拍:周星弛搞笑电影中的管理
Economic Management CEO的海军陆战队
Economic Management CI革命:塑造企业个性与美感的法宝
Economic Management 1999到2000年中国经济发展趋势预测分析
Economic Management Cyber超市的网上销售方案
Economic Management MBA考试辅导英语分册
Economic Management MBA工商管理800案例:管理控制跨国经营
Economic Management MBA工商管理800案例:理财之道竞争谋略
Economic Management MBA考试辅导管理分册
Economic Management MBA考试辅导逻辑分册
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Economic Management 电子厂员工培训教材
Posted on 2010-04-28
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焊盘——PCB表面处理加宽局部引线,无绝缘漆覆盖的部分面积,用来连接元件、明线等等。可以包括元件管脚洞。元件面——即是电路板上插元件的一面。焊接面——电路板中元件面的反面,有许多焊盘提供焊接用。元件符号——每种元件,比如说电阻和电容,都有一个元件符号,这些符号通常被标在电路板的元件面上。不同种类的元件用不同的字母识别,在同种类的元件中,用不同的数字从所有其它项目中识别出来。
例:电容的元件符号为C,一块电路板上有7个电容,可分别表示为C4、C5、C10、C15C16、C39、C40。母板——插着子板的电路板是母板。子板常插入母板的插座中。金属化孔(PTH)——金属管穿过电路板孔洞的表面,连接双面板上的两面电路,在多层板中还起到连接内部电路的作用。
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