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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时间继电器基本介绍

2013/12/31 14:07:48点击:
时间继电器基本介绍
时间继电器早期在交流电路中常采用空气阻尼型时间继电器,它是利用空气通过小孔节流
时间继电器(图1)

  时间继电器(图1

的原理来获得延时动作的。时间继电器由电磁系统、延时机构和触点三部分组成。凡是继电器感测元件得到动作信号后,其执行元件(触头)要延迟一 定时间才动作的继电器称为时间继电器。
目前最常用的为大规模集成电路型成的时间继电器,时间继电器是利用阻容原理来实现延时动作。在交流电路中往往采用变压器来降压,集成电路做为核心器件,时间继电器输出采用小型电磁继电器,使得产品的性能及可靠性比早期的空气阻尼型时间继电器要好的多,时间继电器产品的定时精度及可控性也提高很多。随着单片机的普及,目前各厂家相继采用单片机为时间继电器的核心器件,时间继电器产品的可控性及定时精度完全可以由软件来调整,所以未来的时间继电器将会完全由单片机来取代。