What is the chemical ___ for oxygen? A. symbol B. stage C. step 相关知识点: 试题来源: 解析 【解析】【答案】A 【核心短语/词汇】symbol:符号 【翻译】氧气的化学物质符号是什么吗? 【解析】A.符号 B.阶段 C.步骤。根据句意”氧 气的化学 是什么吗”及选项可知,此处应填 入“符号”,故答案...
Is oxygen the only gas ___ helps fire burn?A that B / C which D what 相关知识点: 试题来源: 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...
Oxygen is a gaseous chemical element vital to respiration. Although pure oxygen is used medicinally, it can be dangerous when...
Even apparently familiar bonds still spring surprises. The donor–acceptor bond, in which one atom donates an electron pair to another, is common in the bonding of ligands to transition metals, but somewhat rare among main-group elements. One example of the latter is the compound carbodiphosphor...
Is HF a hydrogen bond? What is a triple covalent bond? What is the bond order of H2? What is a polar covalent bond? How many covalent bonds can hydrogen form? How does hydrogen and oxygen bond to form water? Water is formed by which type of bond?
Is oxygen the only gas helps fire burn? A. that B. which C. what D. it 相关知识点: 试题来源: 解析 A 本题考查定语从句的关系代词that。解题步骤:①确定从句:从空格到句末。②确定成分:从句“ helps fire burn”缺少主语,从句不完整,因此需要关系代词。另外,当先行词有the only,the very等词...
Is oxygen the only gas helps fire bum?A.thatB./C.whichD.what 相关知识点: 试题来源: 解析 A.that 该句需要填入一个关系代词引导定语从句“helps fire burn”,修饰先行词“gas”。 关键点如下: 1. 当先行词被“the only”修饰时,关系代词通常用“that”而非“which”,因此排除C。 2. “what”不...
An oxygen compressor is a device that forces oxygen gas into a pressurized cylinder. There are many different uses for an oxygen...
A loan is direct borrowing of funds, often with a set interest rate and repayment schedule, while a bond is a debt security issued by entities to raise capital, repaid at maturity.
Friendship is a relationship based on mutual affection, trust, and support between individuals who choose to spend time together and share experiences. On the other hand, a bond can be an emotional tie, but it also encompasses legal or financial obligations that bind entities or individuals. 12...