[单选题]intmain(){inta[][3]={1,4,7,2,5,8,3,6,9};inti,j,k=2;for(i=0;i<3;i++)printf("%d",a[k][i]);return0;}程序的输出结果是
[单选题]$设A={1,2,3,4,5,6,7,8},R是A上的整除关系，B={2,4,6}，则集合B的最大元，最小元，上界，下界依次为?$
[单选题]Givenaqueue{1,2,3,4,5},where1isthefrontand5istherear.Whatwillbethequeuechangedtoafterexecutingthefollowingoperations:enqueue(8),dequeue(),dequeue(),enqueue(9),dequeue(),dequeue(),dequeue(),enqueue(10),
[单选题]12Whatwillbedisplayedbythefollowingcode?()matrix=[[1,2,3,4],[4,5,6,7],[8,9,10,11],[12,13,14,15]]foriinrange(0,4):print(matrix[i][1],end="")
