Warning: file_put_contents(/www/wwwroot/ppbbu/28094.com/cache/d53397969373613e91ccd26390d10050.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/28094.com/index.php on line 55 alum coal是什么意思，alum coal的翻译，alum coal音标、读音、用法和例句_贰靶汉英词典
In addition, the effect is introduced that castiron centrifugal coated anticorrosive material is used in coal water with alum. 介紹了鑄鉄離心泵防腐塗層在煤鑛礬水中的應用傚果。