问题 问答题 简答题

混凝土拆模后应如何养护?

答案

参考答案:应对混凝土采用蓄水,浇水或覆盖洒水等措施进行潮湿养护。也可在混凝土表面处于潮湿状态时,迅速采用麻布,草帘等材料将混凝土暴露面覆盖或包裹,再用塑料布或帆布等将麻布、草帘等保湿材料包裹。并保证包裹物完好无损,彼此衔接完整。内表面应具有凝结水珠,且应尽量延长包覆保湿养护时间。

阅读理解

One evening I went out and left my 17-year-old son and his girlfriend in charge of his 8-year-old brother and 4-year-old sister. I left with complete confidence that the older children would do a wonderful job of babysitting the younger children. Later, I discovered that I was completely wrong.

I had decided to return home earlier than planned so that my son and his girlfriend could go out. I called home with this happy news.But instead of hearing his cheerful, grateful voice on the other end of the line, all I heard was the sound of a telephone ringing.

It was, I should point out, after 10 p.m., when the two younger children should have been in bed, and when the two older children should have been answering the phone. “I’ll give him a lesson, ” I said.I decided they must be outside.Why they might be outside at 10:30 on a winter night I had no idea, but it was the only explanation I could come up with.

Finally, in desperation(绝望), I called his girlfriend’s house. His girlfriend answered.“Yes,” she said brightly, “He’s right here.”

He came on the phone.I was not my usual calm, patient.After all, one of the rules of survival for modern parents is that you can’t trust modern teenagers. “Where are the children?” I said. He said they were with him.They had done nothing wrong.My son had taken the younger children over to his girlfriend’s house just for ice cream and cake. Well, it turns out that I shouldn’t have believed it.It was only part of the truth.

The following Saturday evening we were at my parents’ home, celebrating my birthday.My oldest son gave me the children’s gifts --- a series of lovely color photographs of my children, dressed in their best clothes, and wearing their most wonderful expressions. They are pictures to treasure a lifetime, all taken by the father of my son’s girlfriend.

小题1:The author went out and left her eldest son in charge of the younger children because

_____.

A.she knew that his girlfriend was a good baby-sitter

B.she believed he could take good care of the younger ones with the help of his girlfriend

C.the older children have always loved the younger ones

D.she could not find a baby-sitter on that winter night小题2:Shortly after the author left home one evening, she discovered that _____.

A.her son had brought his girlfriend home

B.her son had left home with his girlfriend

C.she shouldn’t have completely trusted her son

D.she should have taken the children along with her小题3:“It was only part of the truth.” implies that the children not only enjoyed ice-cream but also _____.

A.had their pictures taken

B.received some gifts

C.had a birthday party

D.showed off their best clothes

填空题