测煤浆粘度的注意事项有哪些？

N_A为阿伏加德罗常数，下列说法正确的是（    ）

A．100 mL 1 mol·L^-1的CH₃COOH溶液中含有CH₃COOH分子0.1 N_A

B．等物质的量的N₂和CO的质量均为28g

C．25℃，pH＝13的NaOH溶液中含有OH^－的数目为0.1N_A

D．100mL1mol/L的Na₃PO₄溶液中含有离子数多于0.4N_A

销售服务及其特点。

Claude and Louris are “giraffes”. So are police officers Hankins and Pearson. These men and women don’t look like giraffes; they look like you and me. Then, why do people call them “giraffes”?

A giraffe, they say, is an animal that sticks its neck out, can see places far away and has a large heart. It lives a quiet life and moves about in an easy and beautiful way. In the same way, a “giraffe” can be a person who likes to “stick his or her neck out” for other people, always watches for future happenings, has a warm heart for people around, and at the same time lives a quiet and beautiful life himself or herself.

“The Giraffe Project” is a 10-year-old group which finds and honors “giraffes” in the US and in the world. The group wants to teach people to do something to build a better world. The group members believe that a person shouldn’t draw his or her head back; instead, they tell people to “stick their neck out” and help others. Claude and Louris, Hankins and Pearson are only a few of the nearly 1,000 “giraffes” that the group found and honored.

Claude and Louris were getting old and they left their work with some money that they saved for future use. One day, however, they saw a homeless man looking for a place to keep warm and they decided that they should “stick their neck out” and give him some help. Today, they lived in Friends’ House, where they invite twelve homeless people to stay every night.

Police officers Hankins and Pearson work in a large city. They see crimes every day and their work is sometimes dangerous. They work hard for their money. However, these two men put their savings together and even borrowed money to start an educational center to teach young people in a poor part of the city. Hankins and Pearson are certainly “giraffes”.

56. Which of the following is true?

A. Some of the people around us look like giraffes.

B. Giraffes are the most beautiful animal in the world.

C. “Giraffes” is a beautiful name for those who are ready to help other people.

D. A “giraffe” is someone who can stick his neck out and see the future.

57. “The Giraffe Project” is a group _____.

A. of police officers        B. which appeared ten years ago

C. of ten-year-old children   D. which takes care of children

58. People call Claude and Hankins “giraffes” because they _____.

A. do what is needed for a good world       B. are not afraid of dangerous work

C. found a home for some homeless people   D. made money only for other people

59. The passage mainly tries to tell us _____.

A. what giraffes are like

B. what the Giraffe Project is

C. why Claude, Louris, Hankins and Pearson are called “giraffes” 

D. what we should do for a better world

X射线的量和质，其含意正确的是（）。

A.X射线的量和质之和表示X射线的强度

B.量就是X射线光子的数量，质则是X射线光子的能量

C.X射线的量和质之积表示X射线的强度

D.X射线的量和质成反比关系

E.X射线的量和质成正比关系

不属于账户“金额要素”的是( )。

A．期初余额

B．期末余额

C．借方发生额

D．本期减少额