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- Polyester resins are the condensation products of polybasic acids and polyols. 聚酯樹(shù)脂是多元酸和多元羥基化合縮聚而成。
- 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. 所述的化合層之化合物為利用聚酯、尼龍或纖維素織物與多元酸衍生物化合處理,以化合成具有吸水、吸味功效之化合層。
- Alkyds are the condensation product of polybasic acids and polyhydric alcohols (polyls). 多元醇酸樹(shù)脂由多元酸和多元羥基縮聚而成。
- 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級脂肪酸的組成。
- 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. 采用硫酸甲酯化處理山楂果樣品,二氯甲烷作萃取劑,用氣相色譜-質(zhì)譜聯(lián)用法對山楂果中的多元酸和高級脂肪酸進(jìn)行了全面分析。
- Keywords polybasic acid;titration curve;calculating and plotting; 多元酸;滴定曲線(xiàn);計算繪制;
- 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處理刺梨果樣品,用氣相色譜-質(zhì)譜聯(lián)用(GC-MS)分析其多元酸和高級脂肪酸含量,用面積歸一化法得出各有機酸的相對含量。
- 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. 摘要對2004年39份云南烤煙樣品及2份國外烤煙樣品的多元酸和高級脂肪酸進(jìn)行聚類(lèi)分析。
- We have three periods of chemistry a week. 我們一星期三節化學(xué)課。
- Keywords hawthorn fruit;polybasic acid;higher fatty acid;gas chromatography-mass spectrometry;analysis; 山楂果;多元酸;高級脂肪酸;氣相色譜-質(zhì)譜聯(lián)用;分析;
- The scientist probed into the secrets of chemistry. 這位科學(xué)家探索了化學(xué)的種種奧秘。
- Keywords eliminating-item and simplifying equation method;polybasic acid and polybasic alkali;ecidity calculation; 消項簡(jiǎn)化方程法;多元酸堿平衡;酸度計算;
- Chemistry was her favourite subject at school. 她上學(xué)時(shí)最喜歡化學(xué)。
- He gave me a taste of his acid wit. 他讓我嘗到了他敏銳尖刻之機智的滋味。
- Acid irritates the stomach lining. 酸能刺激胃黏膜。
- Acid had pitted the surface of the silver. 酸把銀器的表面腐蝕了。
- No one can cope with him in Chemistry. 在化學(xué)方面，誰(shuí)也比不上他。
- I am not good at organic chemistry. 我的有機化學(xué)學(xué)得不好。
- We will do a Chemistry experiment this Friday. 這個(gè)周五我們要做化學(xué)試驗。
