Warning: file_put_contents(/www/wwwroot/ppbbu/52065.com/cache/5853ee25f41f21d5179371bc21730447.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/52065.com/index.php on line 55 back electromotive force constant是什么意思，back electromotive force constant的翻译，back electromotive force constant音标、读音、用法和例句_伍贰汉英词典