A．the high pay makes her feel obliged to do it

B．she was required by the contract to do it

C．she wants to experience the real life of the character

D．it was fun to do it

数据库管理系统中，为了保证事务的正确执行，维护数据库的完整性，要求数据库系统维护以下事务特性： 【19】 、一致性、隔离性和持久性。