Warning: file_put_contents(/www/wwwroot/zidian/oumou.cn/cache/e61efc36ae8e589360dc2a1d9b2dbe32.txt): failed to open stream: No space left on device in /www/wwwroot/zidian/oumou.cn/index.php on line 58 acetaldehyde ammonia例句_acetaldehyde ammonia英汉例句_acetaldehyde ammonia双解例句_欧米惠必应词典
There are two manufacturing methods of pyridine bases: extraction from coal tar and catalytic synthesis from ammonia, formaldehyde and acetaldehyde. 吡啶碱的生产方法主要有两种：一是从煤焦油中提取；二是从氨和甲醛、乙醛的合成过程中获得。