主族元素在周期表中的位置,取决于该元素的( ) A.最外层电子数和相对原子质量

题型:选择题

问题:

主族元素在周期表中的位置,取决于该元素的(  )

A.最外层电子数和相对原子质量

B.相对原子质量和核外电子数

C.次外层电子数和电子层数

D.电子层数和最外层电子数

考点:元素周期表
题型:选择题

读“经纬网示意图”,完成下列问题。

(1)图中经纬网的范围是     (南、北)半球,     (东、西)半球。

(2)图中B点的地理坐标是               

(3)B点位于A点的方向               

题型:选择题

If you have no friends around you, it’s time that you should know about your neighborhood. Not all of your neighbors out there are friendly, but at least you need to communicate with them. It is common that when you are new to the neighborhood, your neighbors might actually greet you in an inspiring way.

In other words, they are pleased to welcome you in their neighbor-hood. Both you and your neighbors may start in getting known to each other by introducing yourselves. This is a sign that you and your neighbors are actually friends. Instead of watching television and playing computer games all the time, you also need to take a break and have some fun talking with your neighbors. But if you want to make friends with them, you need to do something that might please them. The only problem for this situation is that you are afraid to approach and greet them in a nice way.

This is a challenge that you or your fellow neighbors must be aware of. You need to get as many friends as possible in your neighborhood, and one of them is to get closer with the unfriendly. If you want to get closer with him but he refuses to be friends with you, don’t force him anymore. Treat him with some respect if you don’t like to create any more problems. However, if he agrees to be your friend, you are lucky and start treating him like a friend. It is very tough to approach a person in your neighborhood, but it is a good challenge. This is how important for you to get closer with your neighbors, even if they’re unfriendly. This is better than sticking yourself alone at home and not having time for social interactions (交往) with real people.

小题1:The passage is mainly about ______.

A.the importance of friendship in our life

B.how to build good neighborhood relations

C.methods to communicate effectively with people

D.how to get rid of misunderstandings with neighbors小题2:Which of the following statements does the writer agree with according to the passage?

A.It’s just natural that all our neighbors are not friendly.

B.Neighbors are usually unwilling to greet newcomers.

C.Television and online games help reduce one’s loneliness.

D.Making friends with the unfriendly neighbors needs patience.小题3:What’s the most difficult in making friends with neighbors?

A.Staying away from television and games.

B.Knowing more about neighbors’ situations.

C.Getting known to each other by introducing.

D.Getting close with the unfriendly neighbors.小题4:The main purpose of the passage is to ______.

A.share experience

B.provide facts

C.give advice

D.compare opinions

题型:选择题

下列编程元件中,OUT指令能操作的编程元件有()。

A.I、Q

B.M、C

C.T、S

D.D

题型:选择题

应急计划内容包括()等。

A.报警联络步骤

B.应急措施

C.可能事故的性质和后果

D.应急指挥中心地点和机构

题型:选择题

造成合成塔催化剂床层同平面温差较大的可能原因有()。

A.催化剂还原时空速偏低

B.催化剂装填时未认真扒平

C.合成塔内件安装存在问题

D.系统负荷高

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