选择题:____ a teacher in our college, it is necessary to

题目内容:
____ a teacher in our college, it is necessary to have at least a master.s degree. 
(A) To become
(B) One becomes
(C) Becoming of
(D) Who becomes
参考答案:

如果有两个事务,同时对数据库中同一数据进行操作,不会引起冲突的操作是( )。

如果有两个事务,同时对数据库中同一数据进行操作,不会引起冲突的操作是( )。 A.两个都是SELECT B.两个都是UPDATE C.一个是DELET

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