Warning: file_put_contents(/home/www/wwwroot/zidian/oclz.com/cache/e5d6db0bf06e1911a7a98db12ccdd51c.txt): failed to open stream: No space left on device in /home/www/wwwroot/zidian/oclz.com/index.php on line 55 bituminous coal dust是什么意思，bituminous coal dust的翻译，bituminous coal dust音标、读音、用法和例句_菜篮子兴趣思朗文词典
The paper reported the epidemiological results of 22-year follow-up study of workers exposed to dust at bituminous coal mines. 本文報道了菸煤煤鑛井下工人22年追蹤觀察的職業流行病學調查研究結果。