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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电磁型电流继电器机械与电寿命要求

2016/8/6 10:30:11点击:

    1、机械寿命应不小于5000次。

  2、电寿命:加额定负荷时,应不小于1000次。

  3、机械寿命试验时,对继电器施加2倍整定值电量使其动作,0.7倍整定值电量使其返回,触点不加负载(但应允许带小于5W的信号负载)。

  4、寿命试验的可靠性:在机械与电寿命试验过程中,继电器的可动系统每次均应可靠动作与返回,触点每次均应能可靠接通和断开(触点间无稳定电弧产生和动静触点粘住        现象),即继电器在机械与电寿命试验中,应保证其工作的可靠性。

  5、电寿命试验速度,应考虑触点上无有害的热积累或离子积累,故一般应按不大于1次/s进行。

  6、寿命试验后,继电器机械性能应良好,其误差允许增加值由产品技术条件规定,绝缘耐压值允许降至规定值的75%.