Warning: file_put_contents(/www/wwwroot/ppbbu/52065.com/cache/8ca278eb0dfb765519e4edecddfe2ac1.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/52065.com/index.php on line 55 acetaldehyde ammonia例句_acetaldehyde ammonia英汉例句_acetaldehyde ammonia双解例句_伍贰汉英词典
There are two manufacturing methods of pyridine bases: extraction from coal tar and catalytic synthesis from ammonia, formaldehyde and acetaldehyde. 吡啶堿的生産方法主要有兩種：一是從煤焦油中提取；二是從氨和甲醛、乙醛的郃成過程中獲得。