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- Polyester resins are the condensation products of polybasic acids and polyols. 聚酯树脂是多元酸和多元羟基化合缩聚而成。
- The chemical layer that I have mentioned above is formed by compounding polyester, nylon, or cellulose fabric with polybasic acid derivative so that it could efficiently absorb water and smell. 所述的化合层之化合物为利用聚酯、尼龙或纤维素织物与多元酸衍生物化合处理,以化合成具有吸水、吸味功效之化合层。
- Alkyds are the condensation product of polybasic acids and polyhydric alcohols (polyls). 多元醇酸树脂由多元酸和多元羟基缩聚而成。
- Objective To analyze polybasic acids and higher fatty acids of Rosa roxburghii Tratt fruit. 目的分析刺梨果中多元酸和高级脂肪酸的组成。
- A new method for the total analysis of the polybasic acids and higher fatty acids in hawthorn fruit by gaschromatography-mass spectrometry(GC-MS)was developed. 采用硫酸甲酯化处理山楂果样品,二氯甲烷作萃取剂,用气相色谱-质谱联用法对山楂果中的多元酸和高级脂肪酸进行了全面分析。
- Keywords polybasic acid;titration curve;calculating and plotting; 多元酸;滴定曲线;计算绘制;
- Methods The polybasic acids and higher fatty acids in Rosa roxburghii Tratt fruit were methylated and then the acidic compounds were isolated and identified by capillary GC-MS method. 方法采用硫酸甲酯化处理刺梨果样品,用气相色谱-质谱联用(GC-MS)分析其多元酸和高级脂肪酸含量,用面积归一化法得出各有机酸的相对含量。
- Eleven kinds of polybasic acids and higher fatty acids of 39 samples of flue-cured tobacco in Yunnan and 2 overseas samples in 2004 were classified by the method of cluster analysis. 摘要对2004年39份云南烤烟样品及2份国外烤烟样品的多元酸和高级脂肪酸进行聚类分析。
- We have three periods of chemistry a week. 我们一星期三节化学课。
- Keywords hawthorn fruit;polybasic acid;higher fatty acid;gas chromatography-mass spectrometry;analysis; 山楂果;多元酸;高级脂肪酸;气相色谱-质谱联用;分析;
- The scientist probed into the secrets of chemistry. 这位科学家探索了化学的种种奥秘。
- Keywords eliminating-item and simplifying equation method;polybasic acid and polybasic alkali;ecidity calculation; 消项简化方程法;多元酸碱平衡;酸度计算;
- Chemistry was her favourite subject at school. 她上学时最喜欢化学。
- 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。
- Acid irritates the stomach lining. 酸能刺激胃黏膜。
- Acid had pitted the surface of the silver. 酸把银器的表面腐蚀了。
- No one can cope with him in Chemistry. 在化学方面，谁也比不上他。
- I am not good at organic chemistry. 我的有机化学学得不好。
- We will do a Chemistry experiment this Friday. 这个周五我们要做化学试验。
