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- The paper was introduction fatty primary secondary amine of secondary amines and production process and application. 本文介绍了脂肪仲胺的反应原理、生产工艺及其应用。
- The experimental condition of acetylating method for determining priminary alcohol and secondary alcohol catalyzed by perchloric acid in the medium of analytically pure ethylacetate is proposed. 提出了以高氯酸为催化剂,分析纯乙酸乙酯为介质,乙酰化法测定伯、仲醇的实验条件,实现了对经典方法的改进,简化了操作程
- DDTs in soil were extracted with acetone/hexane (1:1, v/v) using ultrasonic extraction and removed many polar matrix components using primary secondary amine (PSA) effectively for the purity. 样品用丙酮/正己烷(1:1,v/v)超声波提取,然后用固相材料吸附净化,用GC-MS(选择离子方式)测定。
- Determination of Primary and Secondary Alcohol Catalyzed by Concentrated Sulfuric Acid 以浓硫酸为催化剂乙酰化法测定伯、仲醇
- Asymmetric borane reduction of prochiral ketones is a good process to the synthesis of enantiomerically enriched secondary alcohols. 硼烷对前手性酮的不对称还原是合成手性仲醇的重要方法。
- Production of Secondary Alcohol by Oxidation of Paraffins 正构烷烃氧化制备仲醇的研究
- The disease is still in its primary stage. 这疾病仍然在初发阶段。
- Primary coil induces current in secondary coil. 初级线圈在次级线圈中产生电流。
- Master databases from the primary to the secondary. 数据库从主服务器还原到辅助服务器。
- Some are primary and others are secondary. 一些是主要的另一个比较次要。
- The little boy left primary school at eleven. 这个小男孩十一岁时小学毕业。
- Matter is primary and consciousness is secondary. 物质是第一性的，意识是第二性的。
- Sure. We are friends since primary school. 当然，我们从小学就是朋友了。
- I started primary school when I was 5 years old. 我五岁时开始读小学。
- A primary cause of Tom's failure is his laziness. 懒惰是汤姆失败的主要原因之一。
- Primary school teachers use a lot of visual aids. 小学教师使用大量的视觉教具。
- Love and hatred are primary emotions. 爱和恨是基本的情感。
- The Democratic primary was held this month. 民主党候选人初选於本月举行。
- secondary alcohol 仲醇
- Primary education comes under the umbrella of local government. 小学教育受地方政府的保护。
