题干

已知RO32的R原子核内有x个中子,R的质量数为A,则m g RO32含有电子的物质的量为

A:mol

B:mol

C:mol

D:mol

上一题 下一题 0.0难度 选择题 更新时间:2019-02-02 06:08:46

答案(点此获取答案解析)

A

同类题1

阅读下面的短文, 根据其内容写一篇60词左右的内容概要。

    Recently, a professor of philosophy in the United States has written a book called Money and the Meaning of Life. He has discovered that how we deal with money in our day-to-day life has more meaning than we usually think. One of the things he asks his students to do is to keep a record of every penny they spend for a week. From the way they spend their money, they often see what they really value in life.

    He says our relation with others often becomes clearly defined when money enters the picture. You might have wonderful friendship with somebody and you think that you are very good friends. But you will know him only when you ask him to lend you some money. If he does, it brings something to the relationship that seems stronger than ever before. Or it can suddenly weaken the relationship if he doesn't. This person may say that he has a certain feeling, but if it is not carried out in the money world, there is something less real about it.

    Since money is so important to us, we consider those who possess a lot of it to be very important. The author interviewed some millionaires in researching his book.

    Answer: The most surprising thing is why people give me so much respect. I am nothing. I don't know much. All I am is rich.

    People just have an idea of making more and more money, but what is it for? How much do I need for ant given purposes in my life? In his book, the professor uncovered an important need in modern society: to bring back the idea that money is an instrument rather than the end. Money plays an important role in the material world, but expecting money to give happiness may be missing the meaning of life.

同类题5

历史上,许多国家在工业化的过程中都不同程度地面临农业、农村、农民问题。农民连绵不断的起义迫使亚历山大二世在1861年进行了废除农奴制的改革,但改革后,这些问题依然十分突出。阅读下列材料,回答问题。

材料一 他们(农民)绝没有满足于《解放法令》中的条款,他们觉得这些条款把太大的一部分土地留给了贵族。在以后数十年中,随着农民人口的迅速增加,他们对土地的渴望也相应增长,并变得越来越不满足。……农民不但要为他们在1861年时得到的土地缴纳赎地费,而且还要缴纳各种地方税。此外,他们还要担负俄国工业化的大部分费用,因为很高的保护关税使他们购买的制成品费用上升。

改革后俄国工人数量变化表

时间(年)

1865

1890

1898

数量(人)

381 000

1 620 000

3 000 000

——斯塔夫里阿诺斯《全球通史》

材料二 (19世纪)80年代,俄国基本上完成了工业革命……重工业中煤、铁的产量增加非常迅速。……20世纪初,俄国石油产量跃居世界第一位……在1860-1900年间,俄国工业总产值增长了6倍。

——刘宗绪主编《世界近代史》

材料三 农村中依然保留了“治安官”,他们是从贵族中推选出来的,按照习惯方式断案。如果他们判决错了,农民也没有地方上诉。刑法虽然废除了极为残酷的肉刑,但拷打农民的现象仍然屡见不鲜。

1905年,沙皇政府认为,最严重的危机……是遍及全国的农民暴动。……他们的口号是:“给我们土地,土地应该属于我们,因为我们是土地的耕种者。”