简介云岗石窟?

题型:问答题 简答题

问题:

简介云岗石窟?

考点:艺术学中国美术史中国美术史题库
题型:问答题 简答题

阅读理解(共两节,第一节4小题,第二节1小题;每小题2分,满分10分)

阅读下面短文,并根据短文后的要求答题。

__ 1 ___. This was not because the woods and fields were always far away, but because they were too far from the city to permit people to make a day trip between morning and nightfall.

In 1970, a young German school master had an idea which changed this situation. He decided to turn his little school into a dormitory (宿舍楼) for the summer holidays. Anyone who brought his sleeping bag and cooking equipment along could stay there for a very small quantity of money. The idea was a success. A few years later, the school house was much too small to hold the many young people who wanted to stay there. __ 2 ___  . This was the first hostel. (青年招待所) .

Today, young students and workers of every country can meet in the hostel and get to know each other. When young people arrive at the hostel, they have only to show their cards of membership in a hostel organization in their own country.    ___3____  .

Often, at the evening meal, a group of boys and girls from various parts of the country or world will happen to meet at the same hostel. They may put their food together and prepare a dinner with many kinds of dishes. Sometimes a program will be organized after the meal with dances, songs, or short talks followed by a question period. __ 4 ___. For this reason, a few weeks spent “hosteling” can be just as useful a part of one’s education as classes in school.

第一节 根据短文内容,从A、B、C、D、E中选出最适合放入短文空缺处的选项,并将序号及相应答案写在答题纸上。选项中有一项是多余选项。

A. One can learn a lot about other places, just by meeting people from those places.

B. As a result, a dormitory was set up in an old castle nearby.

C. For years, children in the industrial areas of Europe seldom left their cities to see the beauties of the countryside.

D. More and more young people went to the hostel for summer holidays.

E. This card will permit them to stay in a hostel all over the world for very low prices.

第二节 根据短文所给的信息回答问题,并将序号及相应答案写在答题纸上。

5. According to the passage, why time spent in hostels can be useful or helpful to young people?

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常见的三萜皂苷类型有()

A.羊毛甾烷型

B.乌索烷型

C.羽扇豆烷型

D.螺旋甾烷型

E.齐墩果烷型

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由黄铜矿(主要成分是CuFeS2)炼制精铜的工艺流程示意图如下:

(1)在反射炉中,把铜精矿砂和石英砂混合加热到1000℃左右,黄铜矿与空气反应生成Cu和Fe的低价硫化物,且部分Fe的硫化物转变为低价氧化物。该过程中两个主要反应的化学方程式分别是________________、________________,反射炉内生成炉渣的主要成分是________;

(2)冰铜(Cu2S和FeS互相熔合而成)含Cu量为20%~50%。转炉中,将冰铜加熔剂(石英砂)在1200℃左右吹入空气进行吹炼。冰铜中的Cu2S被氧化为Cu2O,生成的Cu2O与Cu2S反应,生成含Cu量约为98.5%的粗铜,该过程发生反应的化学方程式分别是________________、________________;

(3)粗铜的电解精炼如图所示。在粗铜的电解过程中,粗铜板应是图中电极________(填图中的字母);在电极d上发生的电极反应式为________________;若粗铜中还含有Au、Ag、Fe,它们在电解槽中的存在形式和位置为________。

题型:问答题 简答题

说明调用子程序的规则。

题型:问答题 简答题

提高功率因数能充分利用发电设备和提高输电效率。提高功率因数的常用方法是并联电力电容器。

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