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【简答题】
设有定义整型变量 x=3,y=2; 浮点型变量 a=2.5,b=3.5; 则表达式(x+y)%2+(int)a/(int)b的值是()
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【单选题】It is third time that he______ his homework since he______ to this school
A.
doesn’t finish; comes
B.
hadn’t finished; came C. hasn’t finished; came D didn’t finish; came
【单选题】At the time of the earthquake Jeff was still in his office. He ________ to finish a project before he left for the day.
A.
has tried
B.
had tried
C.
has been trying
D.
had been trying
【简答题】多道批处理系统中引入多道程序的目的是?
【简答题】什么是批处理系统?引入批处理系统的目的是什么?
【简答题】He must finish his homework by today. must调到句首
【简答题】在分时和批处理系统结合的操作系统中引入“前台”和“后台”作业的概念，其目，的是______。
【简答题】在分时和批处理系统结合的操作系统中引入了“前台”和“后台”作业的概念,其目的是 。
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