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- They lack the ability to delocalize the electron deficiency on oxygen. 它们没有使氧原子上的部分正电荷离域的能力。
- These processes are frequently catalyzed by acids and involve electron deficient intermediates called carbocations. 这些过程通常由酸催化;牵涉缺乏电子;名为碳正离子的中间体.
- Abstract : A novel efficient procedure has been developed for the conjugate addition of amines to electron deficient alkenes. 摘要 ： 提供了一种新型高效的催化缺电子烯与胺类的共扼加成的反应体系。
- The results showed that the catalyst was very efficient for the conjugate addition of amines to electron deficient alkenes with excellent yields in several minutes. 在进一步的催化反应过程中发现，该催化剂对反应具有很高的催化活性，能催化该反应在短短数分钟内完成。
- I have a slight calcium deficiency. 我有点缺钙。
- They lack the ability to delocalize the electron deficiency on oxygen 它们没有使氧原子上的部分正电荷离域的能力。
- This paper deals with the reaction of 1,2,3 trisubstituted electron deficient cyclopropane derivatives cis 1 carbomethoxy 2 p substitutedphenyl 6,6 dimethyl 5,7 dioxo spiro [2,5] 4,8 octadiones with thiophenol to give the products 4 and 5a. 报导1;2;3-三取代贫电子环丙烷衍生物顺-1-甲氧羰基-2-对位取代苯基-6;6-二甲基-5;7-二氧-螺-[2;5]-4;8-辛二酮与苯硫酚的反应.
- The child has a calcium deficiency. 那孩子缺钙。
- The transmitter was pulsed by an electron tube. 电子管使发射器产生脉冲波。
- An electron tube having a cathode and an anode. 电子二极管有一个阳极和一个阴极的电子管
- The deficiency of this plan is very clear and it can't possibly succeed. 这项计划的缺陷是很明显的，它不可能成功。
- The deficiency in this plan is very clear. 这个计划的不足之处显而易见。
- The result in either case is an energy deficiency. 不论哪种情况结果都会导致能量损失。
- It is diligence that makes up for deficiency. 勤能补拙。
- The deficiency in this plan be very clear . 这个计划的不足之处显而易见。
- The number of electron pairs an atom can share with other atoms. 共用电子对数，共价一个原子与其他原子共用的电子的对数
- A deficiency of Vitamin ??results in rickets. 缺乏维生素?业贾仑?偻
- An electron with a negative charge, as contrasted with a positron. 电子带有负电荷，与正电荷相反的电子
- Acquired Immune Deficiency Syndrome. 全称获得性免疫功能丧失综合症。
- Vitamin deficiency in the diet can cause illness. 饮食中缺乏维生素可能导致疾病。
