假设用户正在执行UPDATE操作，此时用以下哪种方法可以关闭数据库（）
- A、SHUTDOWN或SHUTDOWN IMMEDIATE或SHUTDOWN ABORT
- B、SHUTDOWN或SHUTDOWN NORMAL或SHUTDOWN TRANSACTIONAL
- C、SHUTDOWN NORMAL或SHUTDOWN ABORT或SHUTDOWN IMMEDIATE
- D、SHUTDOWN或SHUTDOWN IMMEDIATE或SHUTDOWN TRANSACTIONAL
- E、SHUTDOWN ABORT或SHUTDOWN IMMEDIATE或SHUTDOWN TRANSACTIONAL
正确答案:A
答案解析:有
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