来自专业的译者、企业、网页和免费的翻译库。
* crude-öljy.
* crude oil.
最后更新: 2011-08-01
使用频率: 1
质量:
警告:包含不可见的HTML格式
648-029-00-3 pyridine, alkyl derivs.; crude tar bases;
[the complex combination of polyalkylated pyridines derived from coal tar distillation or as high-boiling distillates approximately above 150 oc (302 of) from the reaction of ammonia with acetaldehyde, formaldehyde or paraformaldehyde.]