Warning: file_put_contents(/home/www/wwwroot/tjuzi.com/cache/04dbf73237d021a9289b22761524b5cb.txt): failed to open stream: No space left on device in /home/www/wwwroot/tjuzi.com/index.php on line 55 acetaldehyde ammonia例句_acetaldehyde ammonia英汉例句_acetaldehyde ammonia双解例句_橘子化妆朗文词典
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。