8.下面哪一个不是 Python 的数据类型？ A: 列表（List） B: 字典（Dictionary） C: 元组（Tuples） D: 类（Class）

可以作为字典中“键”（key）的数据类型有哪些？ A: Lists B: Dictionaries C: Numbers D: Tuples E: Strings

Which of the following is WRONG in the relation rules? A: There is no order on the rows. B: There is no order on the columns. C: Two tuples can be identical in all column values. D: Multi-valued attributes are not permitted.

Which of the following is WRONG in the relation rules? A: There is no order on the rows. B: There is no order on the columns. C: Two tuples cannot be identical in all column values. D: Multi-valued attributes are permitted.