CO2 is ___ one carbon atom(碳原子)and two oxygen(氧)atoms. A. made from B. made of C. made up of 相关知识点: 试题来源: 解析 C [详解] 句意:CO2有一个碳原子和两个氧原子组成。 考查动词短语。A. made from表示由……制成,看不出原材料;B. made of表示由……制成,可以看出原材料;...
The oxygen atom is nearly___ the hydrogen atom.相关知识点: 试题来源: 解析 16 times as heavy as15 times heavier than16 times the weight of 解析: 第7题需要填入介词,根据句意和固定搭配,应填入“For”,表示“因此”。 第8题需要填入动词的-ing形式,构成“keep doing sth.”结构,表示“继续做某事...
L. D. CalvertJ. B. TaylorInternational Union of CrystallographyActa CrystallographicaIs there an oxygen atom in La2Sb. Y. Wang,L. D. Calvert,J. B. Taylor. Acta Crystallogr. Sect. B . 1980Wang Y., Calvert L.D., Taylor J.B. (1980), Acta Crystallogr. B 36, 220–221....
aThe oxygen atom of the water molecule is more electronegative than the hydrogen atom (i.e., it attracts more the electrons). As a result, the side of the molecule with the oxygen atom has a partial negative charge. A molecule with such a charge difference is called a dipole.[translate]...
The atomic number of oxygen is 8. This means that an atom of oxygen, regardless of the isotope, will have exactly 8 protons in its nucleus. The...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your ...
百度试题 结果1 题目The hydrogen atom is nearly 16 times as light as the oxygen atom.相关知识点: 试题来源: 解析 氢原子的重量约为氧原子的1/16(或比氧原子轻约15/16)。反馈 收藏
【题目】CO2 is ___ one carbon atom(碳原子)and two oxygen(氧)atoms. A.made fromB.made ofC.made up of试题答案 在线课程 【答案】C 【解析】 句意:CO2有一个碳原子和两个氧原子组成。 考查动词短语。A. made from表示由……制成,看不出原材料;B. made of表示由……制成,可以看出原材料;C....
【题目】CO2 is ___ one carbon atom(碳原子)and two oxygen(氧)atoms. A.made fromB.made ofC.made up of试题答案 在线课程 【答案】C 【解析】 句意:CO2有一个碳原子和两个氧原子组成。 考查动词短语。A. made from表示由……制成,看不出原材料;B. made of表示由……制成,可以看出原材料;C....
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in which R is a C1-C10-alkyl group and R1 is an aliphatic or cycloaliphatic radical which may be substituted by hydroxyl groups or interrupted by nonadjacent groups -Y-, where Y is an oxygen atom, a sulphur atom, a group NR<2> or N<+>R<2>R<3>X<->, in which R<2> and R<...