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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. 研究發(fā)現在聚酰亞胺的良溶劑NMP、DMA中可加入多至50%25體積的非溶劑乙二醇醚類(lèi),混合溶劑仍能溶解所研究的聚酰亞胺;
- Any of several carcinogenic or teratogenic heterocyclic hydrocarbons that occur as impurities in petroleum - derived herbicides. 戴奧辛一種致癌或致畸雜環(huán)族碳氫化合物，在從石油提取的除銹劑中以不純物出現
- 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劑體系的吸水性。
- Some trifluoethoxylpyridine ether derivatives were successfully synthesized by reacting 4-nitro-pyridine-N-oxide derivatives with trifluoroethanol in the presence of alkali. 在催化劑碘化亞銅作用下,用鹵代芳烴衍生物與2,2,2-三氟乙醇鈉進(jìn)行反應,制得芳烴三氟乙基醚。
- A whiff of ether will put you out in a few seconds. 一劑乙醚幾秒鐘后就會(huì )使你失去知覺(jué)。
- THE SYNTHESIS AND CHARACTERIZATION OF RARE EARTH COMPLEXES OF TRICYCLE AZACROWN ETHER DERIVATIVE 三環(huán)氮雜取代冠醚配體及配合物的合成與表征
- Keywords inorganic chemistry;triaza-crown ether derivative;rare earth complexes;luminescence properties;rare earth nitrates; 無(wú)機化學(xué);氮雜冠醚衍生物;稀土硝酸鹽;熒光性質(zhì);稀土;
- An organic derivative, such as coal or petroleum. 有機衍生物一種有機衍生物，如煤或石油
- Today's news goes into the ether and is soon forgotten. 今天的新聞廣播聽(tīng)後不久即置於腦後了。
- It was once believed that light waves traveled through the ether. 人們曾經(jīng)相信光波在以太中穿過(guò)。
- Are herbicides hazardous to your health? 除草劑對你的健康是危險?
- Ether was used formerly to put a patient to sleep before an operation. 從前人們在手術(shù)前用乙醚來(lái)使病人昏睡。
- An acyl derivative of hydrazine. 酰肼一種由肼衍生而來(lái)的酰
- diphenyl ether derivative 二苯醚衍生物
- New herbicides and pesticides were developed. 新型除草劑與殺蟲(chóng)劑得到開(kāi)發(fā)。
- A mark used as a superscript to indicate the first derivative of a variable. 撇號置于右上角的符號，用以標明變量的第一個(gè)導數
- The hospital smelled of formaldehyde and ether. 醫院里充滿(mǎn)甲醛和乙醚的味道。
- Most herbicides were degraded and run off in soil. 大部分除草劑在土壤環(huán)境中被降解或流失。
- The derivative of the step is the impulse. 階梯的導數就是脈沖。
- He went off at the first whiff of ether. 他一吸入醚就失去知覺(jué)。
