Mike Krzyzewski is really a famous coach of Dream Team. She has coached north america men's basketball team for some time, that's clinched numerous medals for his country. Following Londonfl jerseys supplyn Olympic was over, Krzyzewski told The Associated Press that this game will be his final one as national coach, a job he's held for seven years. He had left open the possibility of swomen nfl jerseystaying with the team beyond the London Games, when practice on Saturday said these will be his last Olympics.When asked if he was sure, Krzyzewski didn't hesitate before again saying, "yecheap nfl jerseys wholesales," this will be his last game "If we could win it, then it might be three major championships in a row, i always do not know when that has been done because we haven't usually won http://govoriotkrito.bg/libs/nflcn08.htmthe globe championships," Krzyzewski said. "It becomes an enormous thing for the program." Whatever, he's an awesome coach. His achievement are going to be remembered by the country.cheap nfl jerseys
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松川继电器的一些常用知识-元则电器

2016/8/7 13:57:50点击:
1、外形、安装方式、安装尺寸 松川继电器的外形、安装方式、安装尺寸品种很多,用户必须按整机的具体要求,提出具体的安装面积,允许继电器的高度、安装方式、安装尺寸。这是选择继电器首先要考虑的问题。以下几个问题,选用时应予以注意: (1)对于PC板式引出脚;脚间距大都为2.54×n(n=1、2、3……,以下同),如JZW5;也有2.5n,如JZG2-2/B;也有不符合标准间距的继电器,如MR72。引出脚的长度一般为3.5。

  (2)引出脚的可焊性、继电器的抗焊接热、引出脚相对底座的不垂直度等应有严格的要求。 (3)快连接式继电器;快连接引出脚通常有250#(6.35×0.8)、187#(4.75×0.5)2种。这类引出脚要特别注意插拔力要求,250#引出脚: 拔力矩>10kg.cm; 187#引出脚: 拔力矩> 5kg.cm。

  (2)温度变化影响:继电器线圈电阻随温度的变化而变化,对继电器吸动、释放电压的影响是明显的。温度上升到极限高温时,释放电压趋于最大值,吸动电压相应升高;温度降到极限低温时,释放电压趋于最小值,吸动电压会有所降低。极限高温下的不吸动或吸合不可靠;极低温度下不释放或释放迟缓,将导致继电器的失效。对电流型继电器,因吸动安匝,释放安匝不受线圈电阻变化的影响,故不随继电器温度的变化而变化。必须指出,有些用户选用电流型继电器,而不是用恒流源作为继电器的激励源,实际上用的是电压源。在这种情况,必须考虑温度对线圈电阻的影响。