Warning: file_put_contents(/www/wwwroot/ppbbu/28094.com/cache/3df57ccd7c0dbd44344bfe686101f2f3.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/28094.com/index.php on line 55 equivalent roughness coefficient是什么意思，equivalent roughness coefficient的翻译，equivalent roughness coefficient音标、读音、用法和例句_贰靶汉英词典