Warning: file_put_contents(/www/wwwroot/zidian/diubi.cn/cache/6b810a1b42363d33fe776441c2dee6e0.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/diubi.cn/index.php on line 59 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_果味酸柯林斯词典