题目内容

a.6.0
b.4.5
c.10.0
d.8.0

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32. Joan sometimes spends the day with Lily' s mother. ()
33. Tilly is satisfied with her appearance. ()
34. Lily' s brother comes to visit every three weeks. ()
35. Lily and her mother play cards more than they watch TV.()

include<stdio.h>
main()
{ int n=30,i=0,t;
float aver=0;
while(i<n)
{scanf("%d",&t);
aver=aver+t;
}
aver=aver/n;
printf("平均成绩为:%5.1f\n",aver);
}
错误:______
改正:______

A 任何查询语句都可以用 union 来连接
B union 只连接结果集完全一样的查询语句
C union 是筛选关键词,对结果集再进行操作。
D union 可以连接结果集中数据类型及个数相同的多个结果集。

写出题下图所示Windows任务栏各部分的名称。

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