一般情况下PC机中的硬中断服务程序执行的是( )。A．外部中断请

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问题单项选择题

一般情况下PC机中的硬中断服务程序执行的是( )。

A．外部中断请求CPU完成的任务

B．主程序中安排的转移指令

C．主程序中安排的转移指令

D．主程序中安排的调用指令

答案

参考答案：A

阅读理解

阅读理解。

1. What is the name of the store?

A. Plaza Center

B. WAL★ MART

C. SUPER SALE

D. PRODUCE DEPARTMENT

2. How many hours is it open every day?

A. Seven.

B. Eight.

C. Ten.

D. Fourteen.

3. Which is NOT on sale according to the advertisement?

A. Oranges.

B. Cheese.

C. Pizza.

D. Apples.

4. What does it mean by "Super Food-Super Prices" ?

A. Our prices are very high.

B. We have a wonderful store.

C. We sell good food at good prices.

D. Our store is more than just a supermarket.

单项选择题

关系模式R中若没有非主属性，则

A．R属于2NF，但R不一定属于3NF

B．R属于3NF，但R不一定属于BCNF

C．R属于BCNF，但R不一定属于4NF

D．R属于4NF