放映合成

（1）画出磷原子的原子结构示意图：___________。

（2）写出H₂S分子的电子式：___________。

（3）写出表示含有8个质子，10个中子的原子的化学符号：___________。

（4）已知阴离子_aX^m-和阳离子_bYⁿ⁺具有相同的核外电子排布，则a、b、m、n之间的关系为a =_______。

（5）用电子式表示氯化镁的形成过程：______________________。

（6）写出Na₂O₂中所含化学键的类型___________。

（7）拆开1molH-H键，1molN-H键，1mol键分别需要吸收的能量为436kJ，391kJ，946kJ：则1mol N₂完全转化成NH₃__________热量（填“吸收”或“放出”）___________kJ；

（8）利用下列反应：Fe＋Cu²⁺＝Fe²⁺+Cu制一个化学电池，写出电极反应式：

负极：____________________；正极：___________________。

在关系代数中专门的关系运算包括选择，投影、 【5】 、除等运算。

In bringing up children, every parent watches eagerly the child’s acquisition of each new skill-the first spoken words, the first independent steps, or the beginning of reading and writing．It is often tempting to hurry the child beyond his natural learning rate, but this can set up dangerous feelings of failure and states of worry in the child: This might happen at any stage．A baby might be forced to use a toilet too early, a young child might be encouraged to learn to read before he knows the meaning of the words he reads．On the other hand, though, if a child is left alone too much, or without any learning opportunities, he loses his natural enthusiasm for life and his desire to find out new things for himself．

Patents vary greatly in their degree of strictness towards their children．Some may be especially strict in money matters．Others are severe over times of coming home at night or punctuality for meals．In general, the controls imposed represent the needs of the parents and the values of the community as much as the child’s own happiness．

As regards the development of moral standards in the growing child, consistency is very important in parental teaching．To forbid a thing one day and excuse it the next is no foundation for morality．Also, parents should realize that “example is better than precept”．If they are not sincere and do not practice what they teach, their children may grow confused, and emotionally insecure when they grow old enough to think for themselves, and realize they have been to some extent fooled．

A sudden awareness of a marked difference between their parents’ principles and their morals can be a dangerous disappointment．

小题1:Eagerly watching the child’s acquisition of new skills _________．

A．should be avoided

B．is universal among parents

C．sets up dangerous states of worry in the child

D．will make him lose interest in learning new things小题2:In the process of children’s learning new skills, parents ______．

A．should encourage them to read before they know the meaning of the words they read

B．should not expect too much of them

C．should achieve a balance between pushing them too hard and leaving them on their own

D．should create as many learning opportunities as possible小题3:The second paragraph mainly tells us that __________．

A．parents should be strict with their children

B．parental controls reflect only the needs of the parents and the values of the community

C．parental restrictions vary, and are not always intended for the benefit of the children alone

D．parents vary in their strictness towards their children according to the situation小题4:In moral matters, parents should __________．

A．observe the rules themselves

B．be aware of the marked difference between adults and children

C．forbid things which have no foundation in morality

D．consistently ensure the security of their children

阳光公司从银行借入款项200万元，专门用于购置生产设备，款项借入期限为3年，年利率为12%，该设备在两个月后安装完毕投入使用。企业于借款到期时一次偿还本息，则应该计入设备成本的利息费用是( )万元。

A．0.4
B．2
C．24
D．4

汽车的（）被人们形容为发动机的消化系统。