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【解析】 chemistry“化学”;chemical“化学的”;chemist“化学家,药剂师”;physician“物理学家”,句意为“他是化学方面的专家,我们都称他为化学家”。 结果一 题目 2.He is an expert at chemistry.We all call him aA.chemistryB.chemicalC.chemistD.physician2.He is an expert at chemistry. We all ...
DETERMINATION OF CHEMISTRY EXPERIMENTAL FORMULA ON UNKNOWN CHEMICAL COMPOUND USING ACCURATE ION MASS MEASUREMENTS OF ALL ISOTOPESPROBLEM TO BE SOLVED: To provide a method for determining experimental formula of an analyte from measured mass spectrum including main peak (A) and one ore more isotope ...
He is an expert at chemistry. We all call him a A. chemistry B. chemical C. chemist D. physician 相关知识点: 试题来源: 解析 C根据空前的冠词a可知,此空需要名词,排除 B项;再参考句意“他是化学方面的专家,因此我们 都叫他化学家。 ”排除A项和D项,physician意为“内科医生”。
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Chemical Name 二十碳五烯酸(all cis-5,8,11,14,17) Eicosapentaenoic acid (all cis-5,8,11,14,17) CAS Number 10417-94-4 Mol. Formula C20H30O2 Mol. Weight 302 Qty 1 25mg Appearance liquid Application Notes 99%,GC, TLC Synonym
Physical Chemistry Topics include Gaseous and liquid states, Atomic structure and chemical bonding, Energetics, and Electrochemistry. Inorganic Chemistry topics include Isolation/preparation and properties of the following non-metals, Ores and minerals, and Extractive metallurgy whereas Organic Chemistry topics...
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