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- Isopropylidene 5-(3-oxo-alkyl)malonates (3) were synthesized by condensation of Mannich base of isopropylidene malonate with methyl ketones in the presence of faint acid, such as acetic acid. 5-烃基丙二酸亚异丙酯的Mannich碱和甲基酮在弱酸如醋酸的存在下;合成得到缩合产物5-(3-氧代烃基)丙二酸亚异丙酯(3).
- By S-allying and selected faint acidic slag technology during reduction period,the recovery yield of S is up to 93%. 通过在还原期S合金化和二次造亚酸性炉渣工艺,把S的收得率提高到93%25。
- The techlonogical characterstics of melting S-steel by alkaline EAF were introduced.By S-allying and selected faint acidic slag technology during reduction period,the recovery yield of S is up to 93%. 介绍了碱性电弧炉冶炼含硫钢的工艺特点。通过在还原期S合金化和二次造亚酸性炉渣工艺,把S的收得率提高到93%25。
- She coloured faintly and seemed put off her stride. 她有点面红耳赤,看来被激怒了。
- One can faintly discern the flavour of lemon. 可以隐约觉得有一点柠檬味。
- I heard a faint sound in the distance. 我听到远处有个微弱的声音。
- Pretending to faint was merely (an) artifice. 假装昏迷只不过是个诡计。
- He gave me a taste of his acid wit. 他让我尝到了他敏锐尖刻之机智的滋味。
- I make sure I am going to faint. 我确信我要晕倒了。
- Acid irritates the stomach lining. 酸能刺激胃黏膜。
- He slumped to the floor in a faint. 他砰一声昏倒在地板上。
- Our chances of victory are very faint now. 现在我们取胜的机会已经微乎其微了。
- Acid had pitted the surface of the silver. 酸把银器的表面腐蚀了。
- A faint smile flickered across her face. 她脸上闪过一丝微笑。
- I am doing an experiment of neutralizing acid. 我在做一个中和酸的实验。
- There is a faint hope that she may be cured. 她获治愈的希望渺茫。
- Can Jones beat Smith? That's the acid test. 琼斯能击败史密斯吗?那是个严峻的考验。
- A faint perfume of jasmine came through the window. 从窗户外飘进一阵淡淡的茉莉花香。
- A faint blush came into her cheek. 她的脸上出现了淡淡的红晕。
- She fell to the ground in a dead faint. 她昏倒在地,全然不省人事。