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问题 单项选择题

发电厂及500千伏变电所220千伏母线事故运行电压允许偏差为系统额定电压的（）。

A、-5%-10%

B、0%-10%

C、-3%-7%

D、5%-10%

答案

参考答案：A

填空题

根据句子和中文提示填入单词的适当形式。

1. As they talked, two secretaries sat behind them and took_______ (笔记), jotting down

    everything they said.

2. There's a lot of_______ (交通) in the rush hour.

3. How much did your dress_______ (花费)?

4. Do you often go out for your_______ (假期)?

5. There are two_______ (婴儿)pandas in the zoo.

6. He said_______ (懒惰) was a terrible thing.

7. We are having a_______ (放松的) holiday in a week.

8. Susan does_______ (好) in English than her brother does.

9. He said_______ (帮助) others brought him lots of joy.

10. Tom's hobby is collecting______ (邮票) of animals.
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填空题

按要求填空
abstract class SuperAbstract
void a()…
abstract void b();
abstract int c(int i);

interface AsSuper

void x();

abstract class SubAbstract extends SuperAbstract implements AsSuper

public void b()…
abstract String f();

public class InheritAbstract extends SubAbstract
public void x()…
public int c(int i ) …
public String f()…
public static void main(String args[])
InheritAbstract instance=new InheritAbstract();
instance.x();
instance.a();
instance.b();
instance.c(100);
System.out.println(instance.f());


在以上这段程序中：
抽象类有：SuperAbstract和　(1)　　(写出类名)
非抽象类有：　　　　　　　(2)　　(写出类名)
接口有：　　　　　　　　　(3)　　(写出接口名)
AsSuper中的x()方法是(4)方法，所以在InheritAbstract中必须对它进行(5)
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