问题
单项选择题
分时操作系统通常采用( )调度算法来为用户服务。
A．时间片轮转
B．先来先服务
C．短作业优先
D．优先级
答案
参考答案：A
解析：分时系统由于需要同时满足多个用户的需要，因此把处理器时间轮流分配给多个用户作业使用，即采用时间片轮转调度算法。
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分时操作系统通常采用( )调度算法来为用户服务。
A．时间片轮转
B．先来先服务
C．短作业优先
D．优先级
参考答案：A
解析：分时系统由于需要同时满足多个用户的需要，因此把处理器时间轮流分配给多个用户作业使用，即采用时间片轮转调度算法。
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Tom was also a 2 boy. One day, a rich man 3 Miser appeared （出现) in front of Tom. He watched his 4 shoes for a while, and then, looked at Tom. Tom knew this kind of people well. They love money but hate to spend it. Tom said, "Let me 5 your shoes, sir. Only two pence (便士), sir. " Mr Miser shook (摇) his head and walked away. Tom thought for a moment andthen called out, "I'd like to clean it for nothing. " This time Mr Miser agreed. And soon one of his shoes was shining brightly. When the rich man put his other shoe on the stool (凳子), Tom said he wouldn'tclean it for him 6 he was paid two pence for his work. Mr Miser was very 7 . He refused to pay anything and went away. But to his 8 , the well-cleaned shoe was so bright that it made the other onelook even dirtier. Mr Miser looked around. People in the street were 9 at him. Finally the rich man 10 and gave Tom two pence. In a very short time his two shoes shone brightly. |