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问题 单项选择题

8259A中断控制器的操作命令字OCW1用来设置8259A内部中断屏蔽寄存器IMR中的各位，当IMR设置为00000100时，被屏蔽的中断请求是

A．IRQ2

B．IRQ3

C．IRQ4

D．IRQ6

答案

参考答案：A

改错题
短文改错。
以下标有题号的每一行均有一个错误，请找出，并按下列情况改正；
此行多一个词，把多余的词用斜线（\）划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词，在缺词处加一个漏字符号（^），在该行右边横线上写出该加的词。
此行错一个词，在错的词下划一横线，在该行右边横线上写出改正后的词。

Dear Grandpa,
How are you those days? I have been missing you very     
much after I went to college a year ago. Whenever I think of     
the old days, I feel very happily. I still remember when I          
was child, you always held me in your arms and told me stories    
till I fall asleep. We often went to the fields to enjoy the pleasant    
view there. You told me the name of different plants and their     
characteristics. Gradually, I became interesting in biology        
and chose to learn biology when I entered into the college. Now   
my friend Ann, together with me, are going to do field study      
and the findings will be use as materials for our research. Since  
we'll do the study in our hometown, I hope to see you by then.
                                              Yours,
                                              Daisy

1. _____
2. _____
3. _____
4. _____
5. _____
6. _____
7. _____
8. _____
9. _____
10. _____
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单项选择题

下列关于流行性乙型脑炎病理改变的叙述，错误的是

A．神经细胞变性、坏死

B．血管套形成

C．软化灶

D．蛛网膜下腔有脓性渗出物

E．胶质细胞增生
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