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- It is observed that a mixed system of a solvent of the polyimide, such as NMP or DMA, and up to 50 volume%of a non-solvent, such as an ether derivative of glycol, can still dissolve the polyimide. 研究发现在聚酰亚胺的良溶剂NMP、DMA中可加入多至50%25体积的非溶剂乙二醇醚类,混合溶剂仍能溶解所研究的聚酰亚胺;
- Any of several carcinogenic or teratogenic heterocyclic hydrocarbons that occur as impurities in petroleum - derived herbicides. 戴奥辛一种致癌或致畸杂环族碳氢化合物，在从石油提取的除锈剂中以不纯物出现
- The addition of ether derivatives of glycol in a solvent can reduce its ability of moisture absorption effectively. 而乙二醇醚的加入可有效地降低溶剂体系的吸水性。
- Some trifluoethoxylpyridine ether derivatives were successfully synthesized by reacting 4-nitro-pyridine-N-oxide derivatives with trifluoroethanol in the presence of alkali. 在催化剂碘化亚铜作用下,用卤代芳烃衍生物与2,2,2-三氟乙醇钠进行反应,制得芳烃三氟乙基醚。
- A whiff of ether will put you out in a few seconds. 一剂乙醚几秒钟后就会使你失去知觉。
- THE SYNTHESIS AND CHARACTERIZATION OF RARE EARTH COMPLEXES OF TRICYCLE AZACROWN ETHER DERIVATIVE 三环氮杂取代冠醚配体及配合物的合成与表征
- Keywords inorganic chemistry;triaza-crown ether derivative;rare earth complexes;luminescence properties;rare earth nitrates; 无机化学;氮杂冠醚衍生物;稀土硝酸盐;荧光性质;稀土;
- An organic derivative, such as coal or petroleum. 有机衍生物一种有机衍生物，如煤或石油
- Today's news goes into the ether and is soon forgotten. 今天的新闻广播听後不久即置於脑後了。
- It was once believed that light waves traveled through the ether. 人们曾经相信光波在以太中穿过。
- Are herbicides hazardous to your health? 除草剂对你的健康是危险?
- Ether was used formerly to put a patient to sleep before an operation. 从前人们在手术前用乙醚来使病人昏睡。
- An acyl derivative of hydrazine. 酰肼一种由肼衍生而来的酰
- diphenyl ether derivative 二苯醚衍生物
- New herbicides and pesticides were developed. 新型除草剂与杀虫剂得到开发。
- A mark used as a superscript to indicate the first derivative of a variable. 撇号置于右上角的符号，用以标明变量的第一个导数
- The hospital smelled of formaldehyde and ether. 医院里充满甲醛和乙醚的味道。
- Most herbicides were degraded and run off in soil. 大部分除草剂在土壤环境中被降解或流失。
- The derivative of the step is the impulse. 阶梯的导数就是脉冲。
- He went off at the first whiff of ether. 他一吸入醚就失去知觉。
