Warning: file_put_contents(): Only 0 of 7748 bytes written, possibly out of free disk space in /www/wwwroot/ndsq.cn/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_开心英文字典_柠咚词
In addition, the effect is introduced that castiron centrifugal coated anticorrosive material is used in coal water with alum. 介绍了铸铁离心泵防腐涂层在煤矿矾水中的应用效果。