| 1. | Direct alkoxylation of aromatic compounds is virtually unknown .
事实上还不知道芳香族化合物的直接烷氧基化的方法。 |
| 2. | The majority of nonaromatic compounds do not have such high c∶h ratios .
大部分非芳香族化合物的CH比例没有这样高。 |
| 3. | They are sometimes difficult to differentiate from aromatic or olefinic absorptions .
有时它们就难于和芳香族或烯烃的吸收峰相互区别。 |
| 4. | The nitrators used in the manufacturing of aromatic nitrocompounds consist of iron vessels .
制造芳香族硝基化合物的硝化器为铁制的容器。 |
| 5. | Incense is burnt in many chinese homes and polycyclic aromatic hydrocarbons have been recovered from incense smoke .
很多中国人家里点香，香的烟中已经发现有多环芳香族碳氢化合物。 |
| 6. | Heterocylic aromatics such as pyridine and pyrimidines also give a somewhat similar set of bands in the 1600 cm region .
杂环芳香族结构类如吡啶、嘧啶类化合物在1600厘米1（625微米）区域也有相似的一组谱带。 |
| 7. | A novel aromatic polyimide synthesized from pmda
新型均苯型芳香族聚酰亚胺的研究 |
| 8. | Pah poly cyclic aromatic hydrocarbon
发动机的多环芳香族碳氢化合物排放物 |
| 9. | Synthesis of aromatic hyperbranched polyesters
芳香族超支化聚酯的合成 |
| 10. | Pcah polycyclic aromatic hydrocarbons
多环芳香族碳氢化合物 |
