下图中A为一种混合气体,已知其中只含两种元素;B、C、D、E均为纯净物. 根据

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问题:

下图中A为一种混合气体,已知其中只含两种元素;B、C、D、E均为纯净物.

根据上述转化关系回答下列问题.

(1)写出有关物质的化学式:B______;C______.

(2)写出反应③的化学方程式:______.

考点:化学反应方程式的书写文字表达式化学式的写法和意义
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短文改错(共10小题;每小题1分,满分10分)

Dear friends,

I’m awfully sorry to hear that a horrible but severe earthquake unexpected hit your hometown. Facing the rarely-seen disaster, we remain so calm and strong –willed that we are all moved to tear. A friend in need is a friend indeed. Think about your present situation, we can wait a minute to make every bit of effort to help you. I, as a chairman of the Students’ Union, on behalf of all my schoolmates, express our most sincerely pity and care for you. Besides, we have made donation of 120,000 yuan to you, expecting that it can help you go through the difficult. A better hometown can rebuilt. Remember we won’t be far away when you need any help.

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关于旅游产业的概念,下列说法正确的有()。

A.旅游产业以旅游资源为基础

B.旅游产业只为旅游者提供游览服务

C.旅游产业是一个以旅游活动为中心的配置产业

D.旅游产业是一个服务性行业

E.旅游产业是一个跨部门、跨行业的产业,所以它是一个独立的经济部门

题型:问答题

关于期货投机的操作,下列说法错误的是()。

A.在买卖合约时,操作品种不要超过三种

B.制订明确的交易计划

C.设定亏损限度

D.倒金字塔买入和卖出

题型:问答题

无机轻集料砂浆保温系统仅包括()保温和()保温两种保温构造。

题型:问答题

按照保险利益原则,债务人对自己的信用具有保险利益。债务人按照债权人的要求以自己信用为标的所投保的险种是()。

A.信用保险

B.责任保险

C.保证保险

D.个人保险

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