将12.4g碱石灰制成溶液,加入13.7g Na2CO3和NaHCO3,反应后得

题型:计算题

问题:

将12.4g碱石灰制成溶液,加入13.7g Na2CO3和NaHCO3,反应后得沉淀15g,经测定,反应后溶液中不含Ca2+、CO32+、HCO3。求

(1) CaO和NaOH各多少g?      (2)Na2CO3和NaHCO3各多少g?

考点:碳单质及化合物单质硅硅酸盐硅酸(原硅酸)
题型:计算题

下面不属于行政给付的内容的是( )。

A.职务方面的权益

B.物质方面的权益

C.与物质有关的权益

D.救灾扶贫

题型:计算题

( )由企业管理费和财务费用组成。

A.企业成本
B.间接费
C.直接费
D.直接工程费

题型:计算题

阅读理解。

     Among rich countries, people in the United States work the longest hours. They work much longer than

people in Europe. This difference is quite surprising because productivity per hour worked is the same in the

United States as it is in France, Spain and Germany, and it is growing at a similar speed.

     In most countries and at most times in history, as people have become richer they have chosen to work

less. In other words they have decided to"spend" a part of their extra income on a fuller personal life. Over

the last fifty years Europeans have continued this pattern, and hours of work have fallen sharply. But not in

the United States. We do not fully know why this is. One reason may be greatly lower taxes in America,

which increase the rewards to work. Another may be more satisfying work, or less satisfying personal lives.

     Longer hours does of course increase the GDP. So the United States has produced more per worker than,

say, France. The United States also has more of its people at work, while in France many more mothers and

older workers have decided to stay at home. The overall result is that American GDP per head is 40% higher

than in France, even though productivity per hour worked is the same.

     It is not clear which of the two situations is better. As we have seen, work has to be compared with other

values like family life, which often get lost in its interest. It is too early to explain the different trends (趋势)

in happiness over time in different countries. But it is a disappointing idea that in the United States happiness

has made no progress since 1975, while it has risen in Europe. Could this have anything to do with trends in

the work-life balance?

1. From the text we know that author ____.

A. says nothing certain about which pattern is better

B. prefers shorter working hours to longer ones

C. believes that longer working hours is better

D. thinks neither of the patterns is good

2. In the last paragraph, the underlined word "which" refers to ____.

A. family life

B. situations

C. other values

D. trends

3. What message can we get from the text?

A. People all over the world choose to work less when they are richer.

B. Americans are happier than Europeans.

C. The GDP of Europe is higher than that of America.

D. Two possible reasons are given for working longer hours in the US.

4. Which of the following would be the best title for the text?

A. Staying at Home

B. Work and Happiness

C. Work and GDP

D. Americans and Europeans

题型:计算题

糖尿病表现为()

A.碳水化合物代谢紊乱 

B.脂肪代谢紊乱 

C.蛋白质代谢紊乱 

D.电解质代谢紊乱 

E.碳水化合物、脂肪、蛋白质、电解质代谢紊乱

题型:计算题

电动机是使用最普遍的电气设备之一,一般在()额定负载下运行时效率最高,功率因数大。

A、0%-95

B、80%-90%

C、65%-70%

D、75%-95

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