根据关联分析中所涉及的数据维，可以将关联规则分类为（）。
A.布尔关联规则
B.单维关联规则
C.多维关联规则
D.多层关联规则
参考答案：B, C
将字母a,a,b,b,c,c排成三行两列,要求每行的字母互不相同,每列的字母也互不相同,则不同的排列方法共有( )
A．12种
B．18种
C．24种
D．36种
按要求完成句子。
1. Remember to bring your homework here next time. (改为同义句)
______ ______ to bring your homework here next time.
2. Could you please clean your room? (作肯定回答)
, I ______.
3. You can't stay out too late. (改为祈使句)
_______ ___ out too late.
4. There is a meeting on Monday. (用next Monday改写)
There______ ______ _______ ______a meeting next Monday.
5. He has to clean his room. (改为否定句)
He______ _______ ______ clean his room.
6. I need to eat breakfast. (改为一般疑问句)
______ ______ ______ ______ ______ breakfast?
