问题
单项选择题
PC中为使工作于一般全嵌套方式的8259中断控制器能接收下一个中断请求，在中断服务程序结束处应( )。
A．执行IRET指令
B．执行POP指令
C．发送EOI命令
D．发送OCW3指令
答案
参考答案：C
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PC中为使工作于一般全嵌套方式的8259中断控制器能接收下一个中断请求，在中断服务程序结束处应( )。
A．执行IRET指令
B．执行POP指令
C．发送EOI命令
D．发送OCW3指令
参考答案：C
| 根据短文内容，用方框中所给的词填空。 | |
then ask about the friend's 2______. Most of the time the conversation is cheerful. Even conversations about 3______ events such as serious illness, family problems, or deaths usually end in a 4______ way. People 5______ special family events such as marriages, births, graduations, new jobs and new homes. One friend will usually 6______ the other good luck or offer congratulations. If the news is unhappy, he or she will express understanding 7______ then add a hopeful suggestion. |