要了解问题的结构即起始状态、要达到的目标状态，从起始状态到目标状态所需要的步骤、算子

在人力资源策略方面，日本的企业比较注重对员工采取( )雇佣的策略。

A．短期

B．长期

C．灵活

D．僵硬

心脾两虚失眠的特点是( )

A．彻夜不眠

B．失眠多梦

C．睡后易醒

D．不易入睡

E．时时惊醒

阅读下面短文，然后按要求写一篇150词左右的英语短文。

An increasing number of students fall in love at an early age and create problems with their studies, which has aroused the school’s attention. A middle school has set a "distance for civilized communication" between boy and girl students. Boys and girls should keep a distance of at least 50 centimeters when they talk in public, otherwise they will be criticized or get an even severer punishment, says an article in Beijing News.

It seems that the school has passed the school regulation to prevent girls and boys from falling in love at an early age and creating problems for the school authorities. Some teachers and parents approve of the regulation because it is of vital importance to the teenagers’ study. However, many experts say the problem, if it is one, can be better solved through communication.

It is natural for a teenager to have a feeling of love on someone from the opposite sex. It is natural for girls and boys to be attracted to each other as they mature sexually.

In fact, normal communication between boy and girl students is good not only for their emotional development and personality refinement, but also for their relationship when they grow up.

[写作内容]

1．以约30个词概括上文的主要内容。

2．以约120个词描述“文明交往距离规定”的利弊，并谈谈你对异性交往的看法。

[写作要求]

1．作文中可以参照阅读材料的内容，但不得直接引用原文中的句子。

2．作文中不能出现真实姓名和学校名称。

在一个肽平面中含有的原子数为（）。

A.3

B.4

C.5

D.6

E.7

锅炉管道安装要点有那些？