建筑物公共疏散出口处内、外()m范围内不应设置踏步。A．1.2 B．1.3 C．1.

My nine-year-old daughter, Maria, is in Grade Two. Every evening we get into homework battles (争执). When she get home, homework is the last thing she likes to do. I think she should do her homework just after school. But she thinks she should have some time to rest and play first. When Maria does her homework, she wants me to help her. I don’t want to help, because I think my daughter should do her homework by herself. And most of the time, I have to do other things.

Children these days have much more homework than we did, and some of it is really difficult for them. As you can see, I’m really worried about homework and I really don’t know what I should do. Any ideas ? Help me!

小题1:The woman’s daughter is __________.

A．four years old

B．six years old

C．eight years old

D．nine years old小题2:The woman thinks that her daughter should do her homework__.

A．by herself

B．with the mother

C．with the father

D．with the classmates小题3:What does the phrase worried about mean?_________ .

A．关心

B．担心

C．涉及

D．思量

（8分）如下图所示物质间的相互转变关系，反应①在工业上可用来生产化合物C，反应⑤在工业上可生产化合物J（Na₂FeO₄），反应①、②、④和⑤均是在水溶液中进行的反应．常温下D、E、G均是气体，B是无色液体；F的水溶液可作为杀菌消毒剂；H是一种铁矿石的主要成分，它由两种元素组成，且其中铁元素的质量分数为70%．

请回答下列问题：

（1）写出F的化学式：________________．

（2）人们将反应①涉及的化学工业称为 ________________．

（3）写出B与D反应的离子方程式________________________________________．

（4）写出反应④的离子方程式______________________________________________．

（5）写出反应⑤的离子方程式______________________________________________．

（6）高铁酸钠（Na₂FeO₄）被人们认为是一种“绿色环保高效”的净水剂，其原因为：

①Na₂FeO₄具有强氧化性可杀菌消毒；

②___________________________________________________________________

施工资料按内容不同可分为（）资料等。

A、施工管理

B、施工单位

C、施工技术

D、建筑结构

E、监理单位

抽样误差就是指由于错误判断事实或者登记事实而发生的误差。

绝大多数可燃物质燃烧都是在蒸气或气态下进行，并出现（）。

A、火花

B、火焰

C、烟雾

D、高温