Oxygen is necessary for animals to breathe and produce energy. Without air, animals cannot survive. 氧气是动物呼吸和产生能量所必需的。没有空气,动物无法生存。 Space 空间 Animals need enough space to move, hunt, and interact with oth...
What type of bond is formed by the attraction between partially charged regions of polar molecules? a. covalent bonds b. ionic bonds c. hydrogen bonds Polar Molecule: The smallest representative unit of any covalent chemical compo...
解析 A核心短语/词汇:help sb./ sth. (to) do sth. 帮助某人/某物做某事句子译文:氧气是唯一的助燃气体吗? 本题考查定语从句。___helps fire burn 用来修饰之前的名词gas, 该从句的引导词在定语从句中做主语,不能省略,先行词有only 修饰时不能用which; what 不能引导定语从句,故选项A符合题意。反馈...
解析 C 关系代词what在这里引导一个名词性从句作to be的表语,同时what在表语从句中又为is的表语成分,这类语法结构还有,如:Show what you have written.(把你所写的给我们看看)和She is not what she was a few years ago.(她可不是几年前的她了)。其他选项均不能表示这种语法关系。
这个句子的主语是water,谓语是will continue to be,表语是what it is today,补语是next in importance to oxygen.what 在句子中表示"什么的样子"就像She is no longer what she was ten years ago.她不再是十年前的样子了.as 不能引导表语从句.而how 是作状语,表示怎样.which指哪一个...
What kind of bond is carbon and hydrogen? What is an example of a hydrogen bond? Is H2O a hydrogen bond? What type of bond joins two hydrogen atoms? What type of bond does hydrogen and oxygen form? Is H2 a hydrogen bond? What is a chemical bond?
what are the first most abundant elements of the universe? i'm just wondering... this site is useful thanks :) Bylittlecircle— On Oct 14, 2007 What types of ions is oxygen likely to form? All The Science, in your inbox Our latest articles, guides, and more, delivered daily. ...
What is the maximum oxygen percentage allowed in a tank?A.12%B.6%C.8%D.10%的答案是什么.用刷刷题APP,拍照搜索答疑.刷刷题(shuashuati.com)是专业的大学职业搜题找答案,刷题练习的工具.一键将文档转化为在线题库手机刷题,以提高学习效率,是学习的生产力工具
Which of the following compounds is expected to have the strongest ionic bonds? A. MgO B. KBr C. NaI D. BaO E. SrS Please explain what a covalent bond is and give some examples. Would N-N be a covalent bond? What is the usual valence associated with oxygen in covalent compounds?
How is aspiration pneumonia treated?You may need any of the following:Antibiotics are given to treat pneumonia caused by bacteria. You may be given antibiotics as pills or through your IV. Steroids are given to reduce swelling in your lungs. You may need extra oxygen if your blood oxygen ...