问题 问答题 简答题

说明面向对象的特征?

答案

参考答案:

面向对象的特征是:

(1)对象唯一性。每个对象都有自身唯一的标识,在对象生存期中,其标识不变,不同的对象不能有不同的标识。

(2)分类性。是指将具有一致的数据结构(属性)和行为(操作)的对象抽象成类

(3)继承性。是子类自动共享父类数据结构和方法的机制,这是类之间的一种关系。

(4)多态性。是指相同的操作或函数过程可以作用于多种类型的对象上并获得不同的结果。

解答题
完形填空
完成表格。阅读下面短文,根据其内容,完成表格中所缺的信息。
What makes a successful speech? First, you should have a good speech script (稿子) so that your ideas and language can attract people's attention. And some skills are necessary, too.
Here are some suggestions on giving great speeches:
◆Beat nerves
Relax yourself before and when making a speech. Practice your opening sentence three or four times. This will help make a sure start and a successful speech. When you stand on the stage, think of the audience(观众) as your family members and friends.
◆Keep it natural
Natural body languages will help your speech: smile, stand straight and look at the audience. Do not drop your head or play with a pen. Also, dressing yourself nicely will help the audience feel respected.
◆Pace and pause (节奏和停顿)
Pace and pause add color to your speech. Speak fast enough to keep people excited and slowly enough for people to fully understand you. After an important point, pause for a moment. It'll change the atmosphere (气氛)in the audience.
Tips on giving speeches
Main tips
Things to do
Advantage
Speech script
Have good    小题1:  .
People's attention is attracted.
Suggested 小题2: 
A: Practice opening sentence three
or four times.
B: Think of the audience as yourfamily members and friends.
A: This can give you a sure start.
B: This can help   小题3: .
A: Smile, stand straight and look at the audience.
B: Dress yourself formally.
A: These   小题4:   will help your speech.
B: The audience will feel respected.
A: Speak fast enough sometimes and slowly enough other times.
B: Pause after an important point.
A: People are kept     小题5:  and can    小题6:   you.
B; The atmosphere in the audience willbe changed.