220V家用交流电频率率50HZ是怎样产生的...

来源：蜘蛛抓取(WebSpider) 时间：2011-10-14 02:08 标签：
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Website Administrator
Something has triggered an error on your
This is the default error page for
nginx that is distributed with
It is located
/usr/share/nginx/html/50x.html
You should customize this error page for your own
site or edit the error_page directive in
the nginx configuration file
/etc/nginx/nginx.conf.The page is temporarily unavailable
nginx error!
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Website Administrator
Something has triggered an error on your
This is the default error page for
nginx that is distributed with
It is located
/usr/share/nginx/html/50x.html
You should customize this error page for your own
site or edit the error_page directive in
the nginx configuration file
/etc/nginx/nginx.conf.The page is temporarily unavailable
nginx error!
The page you are looking for is temporarily unavailable.
Please try again later.
Website Administrator
Something has triggered an error on your
This is the default error page for
nginx that is distributed with
It is located
/usr/share/nginx/html/50x.html
You should customize this error page for your own
site or edit the error_page directive in
the nginx configuration file
/etc/nginx/nginx.conf.以下试题来自：
单项选择题频率为50Hz：的交流电，其角频率是（）。
A.157rad/s&
B.3I4rad/s&
C.628rad/s
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